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Black Butler Arc
Note: This is the anime's adaptation of the Black Butler Arc.
Sebastian tells Ciel Phantomhive to think carefully—once he forms a Faustian contract with him, he will no longer be able to enter Heaven. The boy angrily replies that he has had enough, and agrees to form a contract with him. A shower of black feathers fall around the boy, and Sebastian stands in their midst.
Some time later, Sebastian helps Ciel get ready for breakfast. When he is leaving, Ciel throws at a dart at him. Without turning around, Sebastian catches it. He remarks that while it was a good throw, they should save the games for later, and Ciel agrees.  The entire household is present when Ciel sits down for breakfast. Ciel throws a dart at Finnian's head, making him bleed. Holding his head, he asks Ciel why he did that. Ciel replies that he does not need to justify his actions. Upon entering the dining room, Sebastian asks Mey-Rin if she has finished washing the sheets, Finnian if he has finished weeding the garden, and Baldroy if he has finished preparing dinner. When Sebastian learns that they have not, he orders them to get to work. 
Sebastian is working when Ciel summons him. He tells him he wants something sweet to eat. Sebastian refuses, saying he’ll spoil his dinner. Ciel is annoyed, but he ends the discussion by telling Sebastian to take the portrait down—he is head of the Phantomhives now. Sebastian is surprised and pleased by his response. 
Then Sebastian asks Baldroy, Mey-Rin, and Finnian what happened. Finnian used extra strength weed killer on the garden, and everything is ruined. Mey-Rin accidentally broke a tea set that she wanted to use for the guest. Baldroy used his flame thrower to make the food faster, but he ended up burning it. As they all apologize, Sebastian comes up with a plan that can save them.
Finnian works with Baldroy to create a Japanese style garden. When Mr. Damian arrives, Sebastian welcomes him, and Tanaka takes him to Ciel. Sebastian tells the servants that they are able to fix any problem because they are Phantomhive servants. He orders them to remain vigilant until their guest leaves.
Sebastian continues to supervise the servants. He asks Baldroy to cut the meat as he instructs. He asks Mey-Rin to get some special dishes. As she’s running towards him, she trips, and the boxes fly out of her hands. Sebastian easily catches her and the boxes and tells her he’s told her countless times not to run in the manor. She apologizes hurriedly; Sebastian then addresses the three of them telling them that he can handle the rest, and they should all stay calm tonight.
He returns to the study when he asks Ciel and Damian to come to dinner. His eyes narrow when Mr. Damian is crude to Ciel. At dinner, Sebastian explains the meal and has Mey-Rin pour the wine. When she spills it, he swiftly removes the table cloth without letting Mr. Damian notice. Ciel says that this is what his servants are capable of; Sebastian answers that he was able to do this because he’s one hell of a butler. 
After dinner, Ciel resumes his game, and Sebastian brings them some weak coffee. When Damian goes to make a phone call, he explains he did this out of consideration for their guest, but Ciel doesn’t like its color at all. He instructs Sebastian to offer their guest “Phantomhive hospitality”; when Sebastian agrees, his read eyes are glowing. Sebastian psychologically tortures Damian around the mansion, scaring him so badly until he leaves screaming and injured.
After working so well, Sebastian rewards Baldroy and Finnian with a special dessert and tells Baldroy that an oven repair man will be coming in the morning.  Finally, Sebastian notes that the wallpaper behind the removed portrait will have to be replaced. He sees a memory of a happy Phantomhive household. He claps, and the memory disappears. He states that Ciel is now the new head. 
When Ciel comes out after entertaining Lau and Madame Red, Sebastian notices his mood, and he offers to bring him something sweet to eat. Ciel tells him to bring it to his room; he’s had enough socializing. Sebastian immediately catches the mice and tells the servants to stop playing around and get back to work. Later on, Mey-Rin brings a letter to Sebastian and trips as she’s running toward him. Simultaneously, some gunmen open fire on Sebastian. However, he saves her (as she falls on top of him) as well as the dessert he had prepared for Ciel. Embarrassed, Mey-Rin gets up hurriedly. After reading the letter (which is telling him about Ciel’s predicament) he prepares to depart. After the gunmen’s attack, Finnian and Baldroy come running to see what happened. Sebastian hands Baldroy the pie and tells them all to clean up. Before Baldroy can ask if “clean up” also includes the pie, Sebastian disappears.
Sebastian easily captures Azure’s henchmen and makes them talk. At Azure’s hideout, he fights using the finest Phantomhive cutlery and quickly dispatches the other henchmen. He quickly rescues Ciel from Azures’ clutches, and their relationship is revealed—Ciel is going to give his soul to Sebastian (who is a demon) once he has accomplished his goals and completed his revenge. Until that moment, Sebastian will protect him and obey him. Ciel tells Azure that it’s game over. 
As Sebastian carries Ciel home, Ciel comments that the game was rather boring today. Mey-Rin and Finnian welcome him upon his return. They are worried that he’s hurt, but Ciel assures them that he isn’t. They laugh then, claiming he must be having fun being so high up. Ciel orders Sebastian to put him down. Finally, Sebastian apologizes profusely to Ciel since he has not made any preparations for dinner. 
One day, Grell drops tea on Finnian. Mey-Rin and Baldroy watch as he hops around in pain. They ask Ciel why he took in such a useless idiot; he replies that he had hoped that Sebastian would have been the only one who would be inconvenienced when he agreed with Madame Red to train Grell into becoming a proper butler. Grell wants to kill himself to repent; the servants wonder when he got a knife. Sebastian asks him to stop—if he bleeds all over the floor, it will be trouble for him to clean it up. Grell claims that he’s so nice. Sebastian teaches Grell how to make tea. He tells him he’s willing to teach him, but if he ever wants to commit suicide again, he should do it outside the mansion. Sebastian and Ciel then go to a store to retrieve Ciel’s cane. When they return home, the entire mansion has been transformed into something “cute”. They are both shocked at what’s happening; Sebastian sees Grell hanging from the ceiling and quickly takes him down. He tells Elizabeth that Grell was ruining the aesthetics. She replies that that’s impossible since she made him so cute and does the same to Sebastian. All the servants laugh; however, they are immediately silenced with one look from Sebastian. He tells her he’s honored that she took the trouble to think of him. She wants to make everything and everyone cute, so they can hold a dance party. Grell asks about her identity; Sebastian reveals that she is Ciel’s first cousin and fiancée. 
In Ciel’s study, Sebastian tells him he must learn how to dance, or he will ruin the family name. Although he instructs him, Ciel gives up eventually, telling Sebastian he is too tall. When Sebastian asks him to at least smile and laugh, Ciel angrily replies that he’s forgotten how to have fun. 
Ciel soon comes downstairs, well dressed and ready for the party. However, when Lizzy takes his ring, Ciel yells at her to give it back. Everyone is surprised at his tone. Upset, Elizabeth smashes the ring on the floor. Before Ciel can hit her, Sebastian puts his cane into his hand. He apologizes to Elizabeth for Ciel’s rudeness and explains that the ring was a precious heirloom of the Phantomhive family. Everyone is even more surprised to see him throw the shards out the window. Ciel announces that ring or no ring he is still the head of the Phantomhive household. She starts crying, but Ciel wipes her face and tells her not to cry. He then dances with her while Sebastian plays the violin, and Grell sings. At night when Grell takes Elizabeth home, he thanks Sebastian for helping him learn the ways of a butler. When Sebastian is helping Ciel get ready for bed, he returns Ciel’s ring to him. Ciel is shocked that it’s perfectly fixed. Sebastian answers that it was very brave of him to put on such an act in front of Elizabeth and the others. Ciel says the ring has heard the final breaths of previous Phantomhive heads. He is afraid if he loses it, he will not be able to hear them again. When Sebastian is about to leave, Ciel asks him to stay with him until he falls asleep. 
Jack the Ripper Arc
Note: This is the anime's adaptation of the Jack the Ripper Arc.
The Queen asked Ciel to solve the Jack the Ripper case; therefore, Ciel and Sebastian head to London. When they arrive at the town house, Madame Red, her butler Grell, and Lau are already there. With his arrival, they agree that the Queen’s Watchdog is on the case. Although Ciel is displeased, he takes them along on his investigation. After talking with Sir Arthur Randall, he heads to Undertaker’s establishment. After Sebastian pays his fee (providing him with the finest laugh), he gives them some information about the victims. He concludes that this killer won’t stop until someone stops him. He wickedly questions Ciel if he’ll be able to stop him. Ciel swears by his sullied name and family crest that those who dirty the Queen’s garden will be dispatched without question. 
On the ride home, Angelina and Lau are shocked when Sebastian leaves a moving carriage. When they return, he’s already back with the information. They wonder if he’s just an ordinary butler and not a member of the secret service. He answers he’s just one hell of a butler. In the evening, Ciel, Lau, Angelina, and Sebastian attend a party given by Alastair Chamber of the Druitt Viscount family, one of their main suspects. Since he’s a known womanizer, Ciel dresses as a girl in order to get close to him. Although he’s extremely annoyed, Sebastian reminds him he did say he would do whatever it takes to solve the case. Unfortunately, Lizzie is at the party as well. Ciel is worried he will be caught. Sebastian, nevertheless, skillfully maneuvers him away from her and towards the viscount. Sill when Ciel is chatting with the viscount, Elizabeth is about to approach him again. Sebastian, wearing a masque, intercepts her by setting up a closet to perform a magic trick. He asks Lau for assistance. Taking advantage of Sebastian’s diversion, Ciel slips away with the Viscount. Sebastian asks Lau to secure the closet; once he’s inside he wants him to skewer the closet with multiple swords. When he’s inside, Lau attacks without hesitation. When Sebastian emerges unscathed, the guests are amazed. Lau tells Sebastian he was sure he had killed him. Sebastian replies it did hurt a bit since he didn’t anticipate him coming from above. Lau asks him what his trick was; Sebastian says he told him—there are no traps or tricks. 
Ciel is with Alastair Chamber when he is overcome by some kind of knockout gas. When he wakes up, he is at an illegal underground auction. The seal on his eye lights up, and he orders Sebastian to come and rescue him. Sebastian knocks out all the people in the room, and he rescues Ciel. He tells him the seal on his eye is proof of their contract. Ciel replies that as his prey he will never be able to escape. Sebastian says he never lies like humans; he’ll follow him anywhere, even to Hell. Ciel replies that that’s fine—he is the only who must never lie to him. Ciel believes the Jack the Ripper case has been solved because they have caught the Viscount. Sebastian carries Ciel away from the party. In the morning, there is a report of another murder in the newspaper angering Ciel and making Sebastian suspicious. 
Ciel is next seen playing chess with his aunt; Sebastian is waiting on them. As she reminisces about the past, he tells her everything he’s doing is for himself. He does not need pity or sympathy from anyone. Sebastian is helping Angelina leave when she asks him never to leave Ciel’s side. He promises her he never will. After she leaves, Sebastian gives his report to Ciel. Suddenly, he throws the papers in the air and tells Ciel to put him in check—he is his pawn and his sword. 
In the next scene, Sebastian and Ciel are in street clothes in the street behind the next possible victim’s house. Sebastian doesn’t pay attention to Ciel when he’s talking (annoying Ciel) because he is fawning over a cat. Suddenly a scream shatters the night, and they hurry to the house. When Ciel opens the door, he is overcome by the gruesome scene. Sebastian takes him away. He holds him while he faces the real killer-Grell Sutcliff. Although Grell denies it at first, he then reveals his true form. Sebastian suddenly addresses him as a Shinigami. Grell is also surprised to meet a demon acting as a butler. Sebastian, however, is even more surprised—he asks why he’s behaving like this. Grell says it’s because he fell in love with a woman. That woman is Angelina. Ciel lifts Sebastian’s hand from his eyes when she steps out. She reveals that she’s the true killer; Ciel says that they had their suspicions, but he just refused to believe it. Ciel orders Sebastian to dispose of both of them. When Grell attacks Sebastian, Angelina talks to Ciel. She tells him that he would never be able to understand and attacks him. When she is about to kill Ciel, Sebastian rushes to rescue him. He is going to kill her, but Ciel yells at him not to. 
Grell is impressed by Sebastian’s guts-how he rushed to save Ciel even at the cost of almost losing an arm. He orders Angelina to be as ruthless and kill Ciel. When she doesn’t, he kills her, and her dramatic record is displayed. He is about to leave when Ciel orders Sebastian to get the other “half” of Jack the Ripper. Grell says that he was going to spare them, but he won’t now. He asks Sebastian if he’s afraid—if he gets “hunted” by a real death scythe, he will die as well. Sebastian says since Ciel has ordered him to win, he will. 
Ciel covers his aunt with Sebastian’s coat. Sebastian and Grell exchange words and attacks during their fight. In one attack, Grell slashes Sebastian with his death scythe. However, only the servants’ antics over the past year are revealed. Grell wants to see juicier parts of Sebastian’s life, but he refuses to show them. He jams his jacket into Grell’s chainsaw and knocks him off the roof. Before he kills him, Sebastian asks Ciel if he’s prepared to accept the consequences of his actions. When Ciel asks if he needs to give him the same order twice, he answers that he understands. Although Grell begs him to stop, even offering information about Ciel’s parents’ killers, Sebastian prepares to dispatch him. However, just when he’s about to kill him, William, another Shinigami, stops him. He tells Sebastian he’s here to take Grell back and apologizes for any trouble he may have caused. He’s mortified that he has to bow to vermin like Sebastian. Sebastian replies that they should go and not cause him anymore trouble. Humans are vulnerable when they are forced to stand on the hellish precipice of despair. William answers that demons are the ones who take advantage of their despair. Sebastian doesn’t deny that. 
Finally, William drags Grell away, muttering about how much work he’ll have to do handle. Sebastian throws Grell’s death scythe at him, telling him they forgot it. William catches it, thanks him, and disappears into the darkness. Sebastian apologizes that he let Jack the Ripper escape. Ciel says its fine; he almost collapses from fatigue, but Sebastian catches him. Ciel knocks his hand away, surprising Sebastian. Ciel says he can stand on his own; he doesn’t need help. 
At the funeral the next day, Ciel brings a red dress for his aunt surprising everyone including Elizabeth. Sebastian and Undertaker let red flower petals fly through the church. Afterwards Lau and Ciel discuss the situation. Ciel warns Lau that his opium dens are causing more trouble than usual—he should get out while he can. However, Lau says he hasn’t yet lost interest in England or in Ciel. 
Sebastian and Ciel are next seen at Mary Kelly’s grave. Ciel asked Undertaker to take care of everything since she was an immigrant. Undertaker asks him if he regrets anything; Ciel replies negatively—this is his duty as a Phantomhive. Undertaker says he doesn’t like the way Ciel bears everything and Queen Victoria doesn’t help him. Although Ciel replies that he decided this himself, Undertaker grabs his tie and prays that the collar of duty will not chop off his head. He lets Ciel go, and he tells him that he’s welcome to visit him anytime. 
Alone at the grave, Sebastian asks Ciel why he didn’t shoot his aunt. Ciel replies that it’s his job to protect him. His aunt lost because she hesitated from killing her blood relative. As he walks away, Ciel announces that he will never hesitate. He orders Sebastian to stay by his side and never betray him. Sebastian agrees and bows to Ciel, promising that he will follow him-the king- wherever he goes. 
Note: This is an anime exclusive arc.
Sebastian's finding of a hot spring while taming Pluto also makes the trip successful for the queen, as the town can now be modified into a spa resort. When they leave, it is shown that the village is happily working toward that goal.
Phantom Image Arc
Note: This is an anime exclusive arc.
After their visit, Ciel tries to get a picture of Sebastian with a special camera that shows who the person cares about most. He enlists the help of Finnian, Mey-Rin, Baldroy, and later, Lau, who are all also curious to see Sebastian expressing human-like caring for others. However, Sebastian is able to avoid their attempts, until Ciel puts himself in harm's way. He states that Ciel could have ordered him to stand still for the photo, but Ciel denies knowing what he's talking about. However, before Baldroy and Finnian can develop the film, Pluto sets them and the film (without killing them) on fire; then he runs to Sebastian and gets a reward. That night, Sebastian takes a picture of Ciel sleeping in his study. An image of both Sebastian and a sad Pluto in the background outside of the window confuses the servants; they can't figure out who is the person Ciel cares the most about. Sebastian meanwhile thanks Ciel mockingly for the compliment, much to Ciel's annoyance.
Shard of Hope Arc
Note: This is an anime exclusive arc.
When Ciel and Sebastian learn that the Shard of Hope ring is needed for evidence related to a string of kidnappings from Fred Abberline, they follow him to Undertaker's place to gather more information. There they discover that the ring has been incorporated into the ice sculpture's contest's prize. They try to win the ring from the Frost Fair ice sculpture contest. However, while Sebastian's ice sculpture is awe-inspiring, the original thieves of the ring bomb the ice, causing the ice to crack. Consequently, the ice sculpture and the ring fall into the water. They decide not to worry about it anymore, as they have supposedly lost it to the frozen waters.
However, it ends up in Elizabeth's hands anyway, and leads to Drossel Keinz kidnapping her, which they learn about from Paula. Ciel sends Sebastian off to gather more information while he invades the Mandalay manor with Pluto and Grell. Inside, he encounters Drossel and is rescued from Drossel's dolls by Sebastian. Sebastian reveals that Elizabeth must be in the sealed tower in the back, and they use Pluto to get in. Inside, they find her easily, but they encounter Drossel again. After a brief fight with Drossel, they learn that he is being controlled by someone else, but Sebastian decides not to give chase, because the owner of the puppet controlling Drossel was not nearby.
Afterward, as per Elizabeth's wishes, they celebrate Ciel's birthday with a small party which includes Elizabeth, Paula, and the Phantomhive servants.
Indian Butler Arc
Note: This is the anime's adaptation of the Indian Butler Arc.
Ciel is in London investigating a series of incidents regarding people who have returned from India. He asks Arthur Randall for some information. Although Randall behaves coldly with him, Ciel gets it and leaves with Sebastian. They end up in an unkempt district full of Indian immigrants who attack them. They claim the English are responsible for their misfortune. Ciel orders Sebastian to take care of everything quickly. A well dressed young man unexpectedly arrives and asks the Indians about someone he’s searching for. Noticing the fight, he orders his khansama (Agni) to side with the natives. When Ciel angrily comments that is it customary for them to attack innocent people, the young man realizes “his” people are at fault. He orders Agni to side with the “short one”; Agni easily defeats the natives. The young man tells Ciel he’s looking for someone and leaves. 
Ciel returns to his town house and the servants welcome him home. Lau shows up with Agni and his young master Soma. Ciel is astounded that Soma just imposed himself on him; Soma tells him it’s common sense to host someone one is indebted to. He tells everyone he’s an Indian prince. 
In the morning Soma asks Ciel to help him and be his guide. Sebastian, however, tells Agni and Soma that Ciel must adhere to a strict schedule. When Ciel is practicing his fencing skills, Soma challenges him to a fight—if he wins, Ciel will come with him and help him. He quickly realizes, however, that the foil is not like a real sword. When Ciel is about to defeat him, Agni rescues Soma and attacks Ciel. Although he immediately apologizes that he attacked him without thinking, Sebastian states he must get revenge for Ciel as the Phantomhive butler. Soma tells the two butlers to duel. Nonetheless, Agni and Sebastian are evenly matched, surprising both Ciel and Sebastian. Sebastian quietly tells Ciel he doesn’t believe Agni is a Shinigami; however there is still something strange about him. 
Baldroy wants to prepare dinner, but Sebastian tells him he can handle everything himself. Sebastian leaves the kitchen for awhile; when he returns, he is shocked that Agni is able to put all the servants to work so efficiently. . 
While Ciel and Lau are playing cards, they discuss the situation. Sebastian suddenly tells Ciel that Agni is on the move. Ciel is going to investigate with Lau and Sebastian when Soma announces that he wants to come too. He knows Agni is hiding something from him. He wants to find out what that is. 
The four of them follow Agni to Harold West-Jebb’s home, a known Indian goods buyer. Ciel, however, considers him a despicable rogue. They sneak into his house and listen to the conversation he’s having with Agni. Harold is confident in his victory in the curry contest now that he has got rid of all his rivals and acquired Agni. This way he can obtain the Royal Warrant. In exchange for his help, he’ll tell him all about Meena. Hearing her name, Soma bursts into the room and demands to know the truth. He also orders Agni to defeat Harold. However, Agni attacks Soma instead. In the hallway, Ciel, Lau, and Sebastian discuss the situation. Ciel orders Sebastian to retrieve Soma without revealing his identity. Wearing a mounted deer’s head, Sebastian enters the room and rescues Soma. Lau takes Ciel away as well. 
Back at the town house, Soma is angry and upset over Agni’s betrayal and breaks Ciel’s tea set. That night, Sebastian comes to Soma’s room and informs him about the truth of his life—he never had anything; everything was given to him by his parents. Therefore, it is impossible for him to lose anything even Meena and Agni. Terrified, Soma tires to leave the room and screams that Sebastian is wrong. Before Sebastian can verbally abuse him any further, Ciel stops him. He tells Soma that he was forced to taste humiliation, but he still got up again. He has returned to kill the ones who humiliated and betrayed him. It’s not for revenge—he’s only doing this to make himself feel better. Realizing how wrong he is and how far Ciel went to help him, Soma asks Ciel to befriend him and teach him the ways of the world. Although Ciel doesn’t openly agree to this, he allows him to stay on in the town house. Overjoyed, Soma hugs Ciel surprising him. He also apologizes quietly to Sebastian. Sebastian responds that things have gotten quite interesting. 
In the dining room, Ciel explains the whole situation to Lau and Soma. The incident with the immigrants was West’s plan to remove any competition in the curry contest. In this contest, the company who gets the Royal Warrant will undoubtedly profit enormously. Soma tells Ciel it’s impossible to beat Agni because of his extraordinary curry cooking skills. Nevertheless, Ciel is confident in Sebastian. 
Later on, Sebastian brings Ciel some chocolate in his study. Even though Sebastian uses Soma as a taste tester, nothing can match Agni’s curry. Ciel angrily instructs Sebastian to get to work; he should just add the chocolate he made for him in the curry. Sebastian quietly leaves him. 
The next day, Sebastian helps Ciel get dressed for the contest. Then he takes all of them to the venue. When he has to prepare, he leaves them and goes inside. Agni meets him. He tells Sebastian he won’t lose since he doesn’t want Soma to learn about Meena’s true nature. However, Sebastian replies he won’t surrender either. 
Before the contest starts, Queen Victoria and Ash Landers enter the room. While the Englishmen sing the British National Anthem, Sebastian remains silent. Later, while the judges decide the winner of the royal warrant, the Queen requests one of his curry buns. Through Ash, the Queen praises Funtom's curry bun, saying it brings both adults and children together. Soon after, Meena eats a bite of curry sprinkled with Kalima, a forbidden spice, as it targets the heart's darkest desires. She then goes on a rampage, insulting the queen, as well as all of England. Everyone affected begins to fight alongside her; they are all surrounded by a purple-black glow. Sebastian and Agni fight off the people affected together. He is seen battling Meena. She seems to have abilities similar to the Goddess Kali's, such as multiple arms and enhanced speed and strength. Soma then tells Meena to come and step on him, hoping it will shock Meena out of her rampage. Meena slips and falls on a lobster, giving Soma the opportunity to step on her. Then, Ciel orders Sebastian to force feed the curry buns to everyone affected by the spice. He does so by throwing several into everyone's mouths which ends the rampage. According to Ciel, Sebastian infused the buns with happiness, a complete joke seeing as he is a Demon. Finally, Funtom is declared the winner; they receive the royal warrant and a trophy of an angel holding a silver spoon. Afterwards, Agni thanks Sebastian and the Phantomhive household for teaching him so much; he then says he's embarrassed to have relearned his gods' teachings from an Englishman. Agni then says Sebastian is his friend, much to Sebastian's surprise, as he has never been called that by anyone else.
Haunted Castle Arc
Note: This is an anime exclusive arc.
Ciel learns the castle he is trying to modify into a hotel is home to two ghosts who are scaring off the workers. He and Sebastian go off to investigate, and they encounter King Edward and Richard, two ghosts who have inhabited the castle since their deaths 400 years ago. Ciel initially loses Sebastian to them in a game of chess that Edward cheats at to win because Richard has taken a liking to Sebastian.
However, after learning more about them, Ciel and Sebastian help them find peace with their murders. Sebastian accomplishes this by forcibly taking Richard's skull from him. Although initially distressed, he explains to Edward that the skull is not his own, and they recall the day they were murdered. After finally finding some peace, they move on to heaven, allowing work to resume on the castle. 
Book of Doomsday Arc
Note: This is an anime exclusive arc.
Ash informs Ciel and Sebastian about an occult that is planning to overthrow the government. They go see Undertaker since the occult has been taking shipments of coffins lately. With his help, they go in undercover with Grell to investigate. They learn that only young boys who are a member of the heaven's choir can get close to the mysterious priest who oversees the cult.
Ciel goes in undercover and finds out that a creation of his mother and father has been made into the priest. Sebastian kills it once it tries to strangle Ciel. Angela reveals herself and kidnaps Ciel, taking him to the Grim Reaper library. Sebastian and Grell give chase to try to stop her, but learn from William that if they interfere while she is changing Ciel's cinematic record, then they will alter his history. Nonetheless, Ciel is able to resist on his own. Angry, Angela goes on the rampage, but with Undertaker's aid, Sebastian, Grell, and William stop her for the time being.
Conspiracy and Revenge Arc
Note: This is an anime exclusive arc.
When the body of John Stanley shows up in the river, Ciel and Sebastian try to retrieve something off of it. Ash asks them to do this on the queen's behalf. However, because Ash provides very little information, they go to Lau for help. He promises to spread a rumor on their behalf.
A few days later, Sebastian and Ciel go to the exposition, where Queen Victoria confirms that she is responsible for Ciel's parents' murders. Ciel orders Sebastian to take out Ash and the queen, but their fight endangers the citizens below, so Ciel stops Sebastian, much to his annoyance. As a result, Sebastian abandons Ciel briefly because he thinks Ciel's hesitation has made him unwilling to carry out his plan of revenge. He appears a bit later in the form of the cat, watching over Ciel.
Sometime later, when Sebastian sees Ciel regain focus in a burning London, he abandons the angel Ash/Angela, with whom he had been speaking, to go back to Ciel's side.
Ciel then orders him to kill Ash, so they go confront him. Sebastian is able to defeat Ash by turning into his true demon form. Afterwards, Ciel and Sebastian travel down a river that is flowing with Ciel's cinematic record and arrive at an island that strongly resembles the Isle of the Dead (a painting by Arnold Böcklin.) There, Sebastian moves in and presumably consumes Ciel's soul. The last frame shows Sebastian leaning into Ciel's face, with his eyes glowing red.
Note: This is an anime exclusive arc.
Revival at Trancy's Tragedy ArcSebastian arrives at the Trancy manor as a mysterious traveler carrying a large steamer trunk, requesting shelter from the storm for the night. Alois Trancy agrees after saying that he smells good. He uses the opportunity to go down to the storage room with the child's guidance, taking a box of tea leaves of a flavor called New Moon Drop. A bit later, it is revealed that he is trying to revive Ciel, whose body is stored in the trunk Sebastian is carrying. He is attacked by Claude but manages to flee safely into the woods. Once there, he opens the trunk and gently places an unconscious Ciel in a sitting position. Patting his master on the head, he tells him that it's time to wake up. He opens the New Moon Drop box and takes out the Phantomhive family ring, which had been stored there for an unknown reason as of yet.
As he slips it onto his master's thumb, the ring sparkles mysteriously. Ciel awakens but appears confused and less feisty than usual. His eyes have become dull in color.
Afterwards, Sebastian resumes his role as Ciel's butler while trying to help him seek and complete his revenge a second time, so he can devour Ciel's soul. Therefore, he makes a contract with another demon, Claude Faustus, in which Sebastian will make Alois Trancy the target for Ciel's revenge. Although the contract is still active as symbolized by the dark rose he wears on his jacket, Sebastian clearly displays his dislike for Claude. He states that he will never allow Claude a taste of his master's soul and goes into frequent competitions with him such as cooking pastries  or participating in a Dance Macabre.
Later, when Claude breaks their contract by taking Ciel from him, as opposed to the conditions set down, Sebastian is clearly enraged. When Claude teases Sebastian by kissing Ciel's foot, he becomes so jealous that he tears apart an entire forest to vent his frustration. He, along with Grell, travel to the remains of Alois' (Jim's) village where a woman tells them the story of what happened to the village. Grell uses his Death Scythe to kill the triplets (who have attacked them), revealing their role in the burning of the village. A scene also shows Hannah kneeling before Ciel, holding his hand in a rose garden. Sebastian is again furious with jealousy, as shown by the demonic aura behind him, and he goes to take back his Master.
After confronting Claude, he throws the blackened contract rose into the air as a distraction and punches Claude in the abdomen. He then declares their deal is off.Ciel alters the maze of Alois's Heart which Sebastian & Claude are racing through by answering questions based around Alois. However, now Ciel changes the questions to be based around himself in order to aid Sebastian. When Sebastian gets the question "Why did Sebastian Michealis not eat Ciel Phantomhive's soul?", he explains that it was because he had lost his arm which bore the seal of the contract. In a short amount of time Claude had stolen Ciel's soul. Ciel comes to and calls out to Sebastian; Ciel orders him to come and eat his soul immediately. But Alois quickly returns and both he and Hannah go into the clock tower. Sebastian and Claude agree to work together in order to retrieve Ciel. However they find out that Alois in Ciel's body has made a new contract with Hannah.
Hannah tells the butlers to battle each other to decide who will ultimately gain Ciel's soul. Sebastian eventually kills Claude with the demon sword. While claiming his prize, Hannah reveals her contract with Alois is not to let either butler gain Ciel Phantomhive's soul. She then jumps into the sea with Ciel and also reveals to Sebastian that Ciel shall be reborn as a demon so that he will never be able to obtain Ciel's soul. This is Alois Trancy's ultimate revenge on both Claude and Sebastian. By having Sebastian kill Claude and turning Ciel into a demon, she effectively prevents both butlers from acquiring Ciel's soul.With Sebastian's contract with Ciel is still valid. Now Ciel is reborn as a demon, and Sebastian is under an 'everlasting spell'. He is forced to serve Ciel Phantomhive for all eternity, unable to devour his soul because of its new demon properties; therefore, Sebastian cannot break the contract seal. Sebastian then hands out gifts to all individuals in the series that knew Ciel while Ciel prepares to leave the Phantomhive household. When Tanaka appears, he is wearing the silver lapel pin of the Phantomhive head butler, signifying that Sebastian has returned the pin and in effect tendered his resignation from the post. Ciel and Sebastian are last seen in a field of black and white roses. Sebastian, holding Ciel in his arms, disappears together with him to an unknown place where 'demons and humans are equal'.
Kuroshitsuji: Book of Circus Arc
Note: This is the anime's adaptation of Circus Arc.
For a few moments, Ciel’s past is shown-how he was brutally tortured and the moment Sebastian appeared and formed a contract with him. Presently, Sebastian displays his exceptional skills as a butler. In the morning, he helps Ciel get ready, serves breakfast, and informs him about the day’s schedule. He tells Ciel that at six, Mr. Cedric Brandel (who owns a tea company) and Mr. Lau of Kunlun will be joining Ciel for dinner. Ciel orders Sebastian to give Brandel the Phantomhive hospitality. While Ciel is having his dance lesson with Mrs. Mayerl, Sebastian instructs the servants. Mey-Rin will wash the sheets, Finnian will work in the greenhouse, and Baldroy will make some bread dough. Tanaka, Sebastian says, can stay as he is. When the guests come, Sebastian tells them to stay quietly out of sight. 
Sebastian brings some hot chocolate with caramel and nuts for Ciel in his study. He then proceeds to plan the day’s entertainment. While he’s selecting the cutlery, Mey-Rin screams. Rushing to her, Sebastian finds out she’s used 30 cups of detergent instead of 3. He handles the washing and instructs Mey-Rin to clean up. Afterwards, Sebastian is seen bringing in some flowers. As he’s preparing the table and floral arrangements, he hears Finnian’s cries. Finnian tells Sebastian he used the stove’s heat to try and make the roses bloom faster, but they were destroyed. Exasperated, Sebastian cleans up a little bit, and then tells Finnian to handle the rest. Next, he is seen carrying a dead pheasant into the house. Finally, Sebastian prepares the pheasant for dinner. However, Baldroy uses his flame thrower to try and prepare a new menu and makes a hole in the wall. Sebastian takes his flame thrower and instructs him to fix the hole. 
In the evening, Brandel meets Ciel; Lau tells Brandel he told him Ciel was small and cute. In the dining room, Sebastian has prepared a fantastic tower of crystal champagne glasses with champagne cascading down them. However, while Mey-Rin is serving the hors d’oueuvres, she trips on her shoelaces. The tray slips from her hands and disrupts the entire tower. Nevertheless, Sebastian amazingly rescues every glass. Not even a drop of champagne is spilled. At last he catches the hors d’oueuvres tray on top of the bottle. As Mey-Rin wobbles away, Lau states that Sebastian could catapult to stardom as an acrobat. However, just smiles and says he’s one hell of a butler. 
Ciel immediately asks Brandel to discuss business. Brandel wants the Funtom Corporation to provide food and beverages for his tea salon. Sebastian serves him the new dessert they have designed-galette des rois with added cream and a serving of tea. They have also decided to add a special toy to it. Brandel suddenly lashes out at Ciel, telling him he hates two things-cocky brats and bets that don’t make money. His men attack and seemingly kill Ciel and Sebastian. However, Brandel is unaware that this is only an illusion created by Sebastian. Sebastian explains how he spent all day taking care of Brandel’s men. Backtracking through the day, Sebastian first defeated them with martial arts, next with cutlery, and finally with Baldroy’s flame thrower. Brandel is shocked Sebastian defeated 50 men by himself. Ciel adds that Lau told him Brandel’s selling guns on the black market. The Queen is distressed over London’s increasing gun-related crime rate. Brandel can’t believe that Lau betrayed him; Ciel retorts that he was never on his side in the first place. Desperately, Brandel pulls out his gun and shoots Ciel. Sebastian, however, grabs all the bullets. He states he can’t be killed by such toys. Brandel backs away fearfully, calling Sebastian a monster. Sebastian replies that he is a hellish butler; Ciel ends the conversation stating that the reason no one knows what punishment the Queen’s guard dog gives is simply—dead men tell no tales. Sebastian removes his glove over the glowing seal on his left hand, and Brandel’s screams are drowned by the darkness. 
Lau comes into the dining room, asking Ciel if everything is settled. Ciel asks him where he disappeared to. He replies that some people gave him some Noah’s Ark Circus tickets mistaking him for the mansion’s servant. Puzzled, Ciel takes them. 
Ciel goes to sleep at midnight. He tells Sebastian that the game was dull today. Sebastian states he’ll help him accomplish his foolish revenge-in exchange for his soul. When Sebastian is leaving, Ciel asks him to stay until he falls asleep. Sebastian finally states that a butler’s nights are long. He has to keep a close watch so no one can break his fragile prey-until the day he receives a soul brimming with despair. This a butler’s aesthetic. 
Ciel and Sebastian leave for London. Sebastian leaves the servants in charge of the mansion. They agree wholeheartedly to look after it. On the carriage ride to London, Ciel reads the Queen’s letter to him discussing the recent missing children. She points out most cases have occurred on the circus’ root. She wants him to handle the situation and find them as soon as possible. They go Randall’s office to retrieve some records and meet Abberline. When Sebastian offers him money for his help, he grabs Sebastian’s hand surprising him. Abberline states he only wants the children brought back safe and sound. Ciel tells him to get himself promoted quickly and leaves with Sebastian. 
They next visit Undertaker’s establishment. Once again, he asks for the finest laugh as payment for his information. Sebastian is about to handle it, when Undertaker playfully questions Ciel if he’s going to depend on Sebastian for everything. Provoked, Ciel states he will pay Undertaker; he orders Sebastian to wait outside and not look in no matter what. Sebastian waits outside the whole day until he hears Undertaker chuckle. Undertaker is softly laughing; he can’t believe Earl Phantomhive would go that far. Ciel is exhausted, and Sebastian asks him what he did. However, Ciel doesn’t respond and asks Undertaker to now tell him everything he needs to know. Undertaker tells them he has no knowledge of them. Therefore, Ciel and Sebastian conclude that the Underworld is not involved in the kidnappings. Ciel decides to head to the circus right away. Ciel tells Undertaker to pass along any information that he may receive. As they are leaving, Undertaker tells Ciel that everyone gets one soul—he should be extremely careful with his own soul. Ciel says he is aware of that. 
Consequently, Ciel and Sebastian head to the circus. It looks normal to them; they don’t notice the children in any of the acts. Ciel wants to try and make contact. When Joker asks if anyone in the audience would like to participate in the next trick, Sebastian immediately volunteers. Ciel realizes he’s planning to make contact and gather clues. However, Sebastian proceeds straight to the tiger. Ciel suddenly realizes that Sebastian just wanted to get close to the tiger. As Sebastian fondles the tiger, the Joker and Beast as well as the crowd are shocked by his actions. When Betty (the tiger) tries to eat him, they look on in horror. His antics throw the crowd into an uproar. 
After the performance, Ciel is annoyed that Sebastian drew attention to himself for nothing. Sebastian apologizes; he loves cats and couldn’t resist since he hasn’t been able to discover their true nature no matter how long he’s lived. Ciel starts to sneeze because of his cat allergies and orders Sebastian to stay back. Joker suddenly approaches Sebastian and asks him to come with him to see the circus doctor. Ciel silently gives Sebastian his consent, and he goes with Joker. Sebastian carefully observes different aspects of the circus. Arriving at the medical tent, Joker tells the doctor that Sebastian was injured by Betty. At first, he’s shocked and immediately takes a look at him. However, the doctor is surprised to see that Sebastian is unharmed. Dagger and Beast also come in the tent. They want to show the doctor their prosthetic limbs. Joker even tells Sebastian about himself and his prosthetic hand. When Sebastian provokes Beast and Dagger, he is able to show off his exceptional abilities. Joker is impressed; since he’s so talented, he would like to hire him. Sebastian immediately asks him if he’s serious, surprising Joker. Sebastian states that he’s tired of working for his master and is looking for new employment. Joker is surprised; since he’s so well dressed, he thought he was gentry. Simultaneously, Ciel sneezes while waiting in his carriage. Meanwhile, Joker agrees to even hire the partner that Sebastian says he would like to bring along with him- as long as he is talented. Sebastian takes his leave and exits the tent. He casually moves around, looking for clues. He suddenly runs into Snake who informs him this area is off limits to outsiders.  Sebastian returns to the carriage, and they head back to the town house. On the way, Sebastian wickedly smiles and tells Ciel he needs him to participate in this investigation—he has to join the circus too. 
Ciel angrily retorts that he never ordered Sebastian to go that far. When they return home, Agni and Soma are waiting. Ciel recalls how he tricked them into minding his town house for him. Although Soma wants to spend some time with Ciel, he yells that he’s tired and goes upstairs with Sebastian. There they talk in more detail. Sebastian replies that he was sure that Ciel thought he’s capable of making some decision on his own. If Ciel doesn’t think he can do it, he won’t force him. Finally, Ciel tells Sebastian he has no choice—he’ll join the circus. Sebastian promises to help him on his entrance test tomorrow. 
The next day, Joker and Dagger test “Finnian” (Ciel’s code name). When they ask him what his talent is, Ciel answers probably darts. Although the test is difficult and Joker and Dagger don’t think he’ll be able to pass, Ciel passes thanks to Sebastian’s help. Bewildered, Joker tells him there’s another test—he has to walk across a tightrope without falling. Doll assists Ciel; noticing his fear, she asks him if he will do it. Determined, Ciel answers he will. As he walks across the tightrope, each time he’s about to fall, Sebastian discreetly throws small stones at him so he can regain his balance. Grimacing under the pain, Ciel thinks to himself that he knew this would happen (Sebastian taking any opportunity to ‘play’ with him). Nonetheless, he makes it across. Joker passes him. He gives them stage names; Ciel is Smile; and Sebastian is Black. All the while, Sebastian is quietly laughing knowing well enough how annoyed Ciel is. 
Joker shows Black and Smile around the circus. He feels sorry for Smile since he lost his eye at such a young age. He explains that all of them in the circus are broken one way or the other, so they are sure to get along. He adds that all the first tier members except for Snake have known each other since childhood. He also tells them not to wander around near the first tiers’ tents, since Snake’s tent has a lot of poisonous snakes; they attack any strangers. He finally tells Smile and Black to start practicing. When they are stretching, Sebastian tells Ciel he hasn’t sensed any of the children. He implies that it’s possible that they’re dead, but Ciel tells him not to say unlucky things—the Queen wishes for their safe return. Dagger suddenly comes up to them and tells them to stop stretching and start practicing or the other second string members will advance faster than them. He wants to decide what Smile and Black will do in their act. Sebastian suddenly proves he’s skilled in every circus feat imaginable. Exasperated, Ciel watches Sebastian alongside Dagger. When he’s about to swallow a sword, Dagger tells him that’s enough. Everyone is amazed at his skill. 
Dagger laughs lightly, stating it’s quite surprising to discover two stars in one day. The other star is William T. Spears. Ciel and Sebastian are astounded to see him; his presence proves that something strange is going on at the circus.  William states he smelled something foul—he questions what prey Sebastian is hunting now. Ciel is afraid that everyone will find out that Sebastian is a demon. But Dagger lightly hits ‘Suit’ on the head and tells him to cut it out. He adds that Suit is an occult freak. When Suit states that he will never work with vermin, Dagger tells him that the circus is a team, and they have to work together. Sebastian asks William to assist him, but he refuses. While they quietly argue, Dagger tells Smile to practice. 
William and Sebastian talk outside. Sebastian states there must be some special circumstances for a Shinigami to do undercover work. However, William says he won’t speak about soul related information. That would be like throwing rabbits before a wolf. Sebastian replies he has no interest in cheap souls. William retorts that he can tell Sebastian is starving and half-mad with hunger. Nonetheless, Sebastian replies he’s tired of ripping into every soul he sees. Furthermore, William can rest easy; revealing his hand’s glowing seal, Sebastian informs him he has a lead. Then William speaks plainly. In the next few days, the Shinigami will be reviewing a large number of souls in this area; that’s why he’s here. Sebastian offers to help, but William attacks immediately, stating he doesn’t like to do over time work. In a few moments, Ciel joins them. He tells William not to call Sebastian a demon here. The circus members at first will take it as a joke, but he shouldn’t behave like this. If he is unable to blend with humans, he will be worse than Grell. They collectively decide to stay out of each other’s way as long as they have to work here. Finally, ‘Suit’ asks Smile to keep his pet dog firmly reined in. 
Joker tells them their tent assignments. Smile is with another young boy; Suit and Black are together in tent nine. Smile wants to room with Black, but Dagger laughs and says he need to get his freedom from Black. Ciel, however, senses mutual enmity oozing from both Sebastian and William. In the tent, Ciel chats with the boy (whom he secretly nicknames Freckles); Freckles offers him a Funtom candy. In the other tent, William gives Sebastian the top bunk, divides the living space into two, and informs Sebastian that unlike demons, Shinigami need to sleep. Therefore, Sebastian will not be permitted to do anything that may disturb him at night. Nevertheless, that very night, Sebastian senses the troupe members leaving the grounds. He is about to follow them when William orders him not to wander around without his master. Sebastian comments softly that he’ll be bored until morning. 
In the morning, Sebastian fixes Ciel’s eye patch, remarking that Ciel can’t even get properly dressed without him. When the circus members laugh at him, Ciel orders Sebastian not to treat him like his master here and to leave him alone. Sebastian agrees; he then comically asks what Smile’s done with the potatoes. Freckles is dismayed, but Black tells him he will be able to salvage the situation by making fish and ships. 
After witnessing the scene in the outdoor bath, Sebastian brings Ciel a change of clothes and asks him if he’s alright. Ciel yells at him that he’s had enough—he’ll go mad if things go on like this. Sebastian laughs lightly and replies that this is not like him. It is impossible for such trifles to drive Ciel mad. Remembering his traumatic past, Ciel gets up. He states Sebastian is right; as the Phantomhive head, he’s just not used to living like this. He tells Sebastian that they should get this over with quickly. 
As Sebastian dries him off, Ciel states that he had wanted to rise through the ranks, so he could search the first tiers’ tents. However, since he’s at his limit, they’ll have to sneak in instead. Sebastian prefers using brute force, but Ciel tells him to behave. Ciel wants to go home and eat something sweet. Sebastian promises to make some tea to go with it. 
That evening Ciel and Sebastian are helping the other performers get ready. When Ciel realizes he has a little free time and Freckles isn’t with him, he orders Sebastian to check the tents with him now. However, Wendy has twisted her ankle, and Joker asks Black to take her place. Sebastian tells Ciel that they’ll have to search the tents another time; Ciel replies that they don’t know when they’ll get another chance. He tells Sebastian to tie up the snakes for him now and release them before the encore. That will give him enough time to search. Sebastian asks if he’ll be all right on his own; Ciel replies that he can handle it. 
Sebastian and William are horrified that they have to partner up in the next act. During the performance, William refuses to take Sebastian’s hands. When Beast is about to head back to the tents, Sebastian realizes he has to create a diversion for Ciel. He grabs William’s death scythe. William angrily tells him to let go. However, without even touching him, Sebastian is able to perform an amazing stunt—the crowd roars with applause. 
Suddenly Beast enters to the tent Ciel is in; she changes her clothes and leaves. Luckily, Sebastian has rescued Ciel by coming back earlier. Ciel shows him the photograph; he notes that the man is wearing a signet ring. Since Ciel still has to search Joker’s tent, he orders Sebastian to go back for the encore and release the snakes when he is done. Sebastian is smiling wickedly as Ciel runs out. 
Exhausted, Ciel goes to Sebastian’s tent. He yells at Sebastian, saying Sebastian knew he was still in the tent when he released the snakes. Sebastian playfully replies that it’s his own fault for giving the wrong order. If he’s not careful, he may suffer some nonfatal injury. Finally, Sebastian adds that every game needs its thrills—Ciel’s such an avid player, Sebastian assumed he shared his opinion. Ciel retorts that Sebastian’s “game” is in sickeningly bad taste. He is about to discuss the case with him, when William attacks Ciel. Although he dodges it, William tells Ciel not to cross onto his side—if the master cannot obey the rules, how can William expect the dog to. Irritated, Ciel goes outside with Sebastian. However, he suddenly starts coughing violently. Sebastian can’t understand what’s wrong; Freckles also rushes over when Ciel loses consciousness and collapses. The doctor states that Ciel has suffered a severe asthma attack; he probably had it when he was younger. Any form of heightened stress can trigger a relapse. Freckles guiltily admits that he made Smile go to the outdoor bath today. He immediately offers to take care of him. Using Morse code Ciel instructs Sebastian to continue working on the case. He’ll rest here. 
Stepping outside, William confronts Sebastian. When he attacks, Sebastian defends himself stopping William’s death scythe. William is shocked to see his bloodied hand—Sebastian calmly states he cannot anyone to disturb his master’s rest. He asks William to grant him one hour of freedom, so he can investigate while his master sleeps. Although William refuses, Sebastian still manages to come up with something. He takes advantage of Beast’s vulnerability to find out the name of the workhouse proprietor-Baron Kelvin. In the morning, he collects Ciel to take him back to the town house. He tells William they are leaving because their work here is finishes. William tells him he doesn’t care where he goes as long as his master is with him. Watching them walk away, William is pleased that he can now work in peace. 
Back at the town house, Ciel wants to leave immediately to confront the Baron. However, Soma refuses to let him go because he is sick. Agni criticizes Sebastian’s treatment of Ciel- stating that it is a butler’s duty to always make sure their master is in perfect health. Sebastian is surprised by his outburst and ultimately agrees with Agni shocking Ciel. They succeed in making Ciel rest; in the evening Sebastian quietly states that everything will end tomorrow. He finds the candy Doll gave to Ciel and throws it in the fire. 
The next morning, Sebastian thanks Agni for helping to take care of Ciel. Hiding behind Agni, Soma admonishes Sebastian, telling him Ciel is still just a child and should be pampered once in a while by Sebastian since he has no family. While cleaning the fireplace, Sebastian contemplates Soma’s suggestion. He also receives a phone call from Tanaka. In the evening, Ciel wakes up. Although he is angry that Sebastian let him sleep for so long, Sebastian states that they can no proceed since he is better. When Sebastian tries to coddle him, Ciel tells him to immediately return to his usual behavior. Sebastian agrees, and he informs Ciel that Elizabeth is visiting the mansion. Ciel decides to end this case tonight. When they are about to leave, Soma once again tries to stop Ciel. Ciel quickly tricks him into letting him leave. Sebastian uses his demonic powers to reach Baron Kelvin’s mansion in only one hour. 
Joker is waiting to meet them. Sebastian suggests that they should kill him immediately and rescue the children. Ciel answers that they should wait to meet Kelvin before they do that. Joker suddenly laughs softly and states that he never thought Smile could be the villainous noble or the Queen’s watchdog. He adds that it must be a hard life. Ciel reprimands him by telling him that he doesn’t allow servants to call him by his first name. Joker takes them to Kelvin. Kelvin invites Ciel to dinner and puts on a show to entertain Ciel. The performers in the show and the servers at dinner are all the missing children-more than the police reports had stated. However, they all are in some kind of trance and don’t speak. During the show, grotesque and brutal acts take place; Baron Kelvin laughs wildly, but Ciel is horrified. He orders Sebastian to save one girl; Sebastian confirms that they are all the missing children. He adds that this is indeed one way to enjoy the circus. Ciel darkly states that he’s had enough. He’ll tell the Queen that he found the vile, unsightly, and evil culprit, and he exterminated him with his own hands. He points his gun at Kelvin; Joker attacks Ciel, but Sebastian stops him. Ciel asks Kelvin where the other children are. Kelvin takes them to the cellar. He says that he wanted to be with Ciel that day. When Ciel wonders what day he’s referring to, they arrive at an underground room that is identical to the place where Ciel was tortured.  Baron Kelvin explains his reasons for doing all this (recreating this place with the “lambs” (the children) and bringing Ciel here. He adds that he knows Ciel killed everyone on that day and escaped. He wants Ciel to grant him the same death as the rest of his comrades. 
Outraged, Ciel shoots Kelvin; screaming wildly, Joker breaks away from Sebastian and tries to attack Ciel. However, Sebastian cuts his real hand and tells him not to get in his master’s way. Joker begs Ciel not to kill Kelvin, however, Ciel tells Joker that there are two kinds of people in this world-the ones who steal and the ones who are stolen from. Today, Ciel stole the futures of Joker’s family. Joker laughs maniacally in the sudden realization of this truth; however, he says he’s not the only one who will lose today—Ciel will lose as well. The other members of the circus are going to the Phantomhive mansion. Until they find Ciel, the target, they will kill anyone who gets in their way. Sebastian suddenly laughs quietly, and Ciel is unfazed. He tells Joker that his servants are Phantomhive servants. Once anyone enters their web, no one can escape, and they will die to protect the family’s secrets. Joker fearfully replies that his family won’t be defeated so easily; Sebastian says he is free to believe whatever he likes; nevertheless, Joker should realize that they were all chosen by him. 
Unexpectedly the doctor shows up; Joker tells him to escape quickly because Smile and Black are from Scotland Yard. However, the doctor is nonplussed because he says that Joker and his friends committed the crimes. He suddenly gets up from his wheelchair, proving he’s not lame. He tells a shocked Joker that people trust him more when they think he’s disabled. He rushes over to Baron Kelvin, but he discovers that he won’t make it. He asks Ciel if he can introduce him to the Queen; he may be able to assist her in some anti-aging treatments. As proof of his skill, he offers to show Ciel how he made the circus members’ prosthetics. Ciel suddenly grasps what really happened; Sebastian casually remarks that his materials were unusually refined. Joker is horrified, screams loudly, and collapses when he learns that his hand was made from the bones of the abducted children. The doctor takes a little flower girl out from the cage and takes her to a table. The second he stabs her, Ciel is overcome by his traumatic past. Screaming, he falls to the floor, coughing and gasping. Sebastian gently lifts him up, holds his hand, and undoes his eye patch. He tells Ciel there’s nothing to be afraid of now that he’s outside the cage. All he has to do is command him. Jolted awake, Ciel orders Sebastian to kill them. Sebastian instantly kills the doctor and Baron Kelvin. Ciel orders him to destroy the mansion as well. Sebastian replies that he thought the Queen wanted the children brought back. Enraged, Ciel grabs Sebastian’s face, startling him. Ciel tells him to burn everything—there are no survivors; this is his order. Sebastian sighs and takes off his bloodied glove. Carrying Ciel in one arm, he uses his other hand to ignite the entire mansion. 
When they come out, Freckles faces them. She can’t believe that Smile and Black betrayed them. Ciel replies that he was never on her side. Sebastian adds that they didn’t come to capture them—they came to erase them in the Phantomhive name-the Queen’s loyal watchdog. Shocked that her family has been killed, she rushes at them to kill them; Ciel quietly orders Sebastian to end it. 
The next day, Ciel heads to the orphanage; Joker claimed that they still had brothers and sisters who depended on the Baron. On the train ride, Sebastian questions Ciel, asking him why he decided to kill those children. Ciel replies that children like that can never return to normal—the only reason he survived was because he summoned Sebastian right before he broke completely. Sebastian brought the necessary strength and power he needed to go on. Sebastian answers that that’s quite arrogant of him. Ciel softly replies he is arrogant, but he knows his limits. He is not the kind of person who claims he can save everyone. 
When Ciel and Sebastian get there, they find that the workhouse doesn’t exist anymore. Sebastian comments that it must have been gone for a long time; all the children were probably used in the doctor’s experiments. Ciel suddenly starts laughing wildly. He states that the circus members were trying so hard to protect something that didn’t even exist anymore. They killed, deceived, and even died for nothing. He finally yells that this is how humans are—he is no different. Sebastian is astounded by Ciel’s outburst. Nevertheless, he smiles and quietly laughs. He thinks to himself that humans do whatever they can just so they can get over the hill and faraway. Maybe this is why he, as a demon, finds humans so interesting. 
Kuroshitsuji: Book of Murder
Note: This is the anime's adaptation of the Phantomhive Manor Murders Arc. Please proceed there for more information.