Black Butler: Public School Arc

Butler Sebastian Michaelis works with his 13-year-old master, the Earl Ciel Phantomhive, to do the dirty work of "the Queen's guard dog" in nineteenth-century England's gritty underworld.

One day, Ciel receives a letter from Queen Victoria telling him that several students at Weston College, one of England's top public schools, have seemingly disappeared... including a relative of hers named Derrick. And so, Sebastian and Ciel infiltrate Weston College to get to the bottom of the matter. What truly happened to these students?

(Source: Aniplex)