In Victorian era London, there lies the manor house located in the outskirts of the town of the illustrious Phantomhive earldom and its young master, Ciel Phantomhive. On the night of Ciel Phantomhive's tenth birthday, a fire engulfed his manor, his parents murdered, and he was captured by a mysterious organization. After a month of enduring excruciating torture, Ciel returns to the Phantomhive household with an enigmatic black clad butler, Sebastian Michaelis. To others, it seems that the butler is simply the best at his craft, from anticipating his young master's needs to carrying them out to the best of his abilities. Little do they know, Sebastian is actually a demon that had entered into a contract with Ciel, promising the boy to help him achieve revenge on the arsonists in exchange for his soul. As the Queen's Watchdog and standing at the top of the British underworld, Ciel solves the crimes plaguing London while waiting for the day he will exact his revenge.
