In Victorian era London, on the night of the tenth birthday of Ciel Phantomhive a fire destroyed his manor and murdered both of his parents. In a moment of passing Ceil strikes a deal with a demon, his soul in exchange for revenge. This guy calls himself name of Sebastian Michaelis, to protect and serve Ciel before arrangement has been completed and reaches his butler. 1 month following the fire Ciel returns from being missing. Ceil is the head of their Phantomhive corporation, handling all business affairs as well as the task and searching for his parents murders.