Responding to Queen Victoria's request, Earl Ciel Phantomhive enrolls at Weston College, a renowned all-boys public school known for its traditions and academic excellence, to locate a missing royal family member who vanished several months ago. Leveraging his noble status, the young thirteen-year-old Ciel gains admission as a student, with his demonic butler, Sebastian Michaelis, assuming a teaching position.
Upon arrival, Ciel is surprised to find no trace of the Queen's relative within the school grounds. Additionally, securing an audience with the headmaster, potentially the only person aware of the disappearance, proves challenging. The headmaster's closest associates are the dormitory leaders known as the Prefect 4 (P4), comprising Edgar Redmond, Lawrence Bluewer, Herman Greenhill, and Gregory Violet.
In order to accomplish his objective, Ciel devises plans to win over the P4 members and exploit their influence. However, the esteemed institution and its students harbor numerous concealed secrets, making his task much more complex than initially expected.