Jumbo, Peter and Dagger explain to Snake that they're leaving for the night in the manga, Chapter 30, page 13.
Appears on these pages
Dagger, on the colour page of Volume 7. Dagger in East End, when younger.
Peter and Wendy, on the cover of Chapter 30. Peter, on the colour page of Volume 7.
Snake (スネーク, Suneeku) is the footman of the Phantomhive household. He was formerly a...