Kuroshitsuji

Black Butler (Japanese: 黒執事 Hepburn: Kuroshitsuji?) is a Japanese manga series written and illustrated by Yana Toboso. Since its debut on September 16, 2006, it has been serialized in Square Enix's shōnen manga magazine Monthly GFantasy.

The series follows Ciel Phantomhive, the thirteen-year-old (as of chapter 14) head of the Phantomhive family, an aristocratic family known as the Queen's Guarddog, and tasked with solving crimes in London's underworld. Ciel has formed a contract with Sebastian Michaelis to seek revenge against those who tortured him and murdered his parents. Sebastian is a demon who has taken on the disguise of a butler, and in exchange for his services he will be allowed to consume Ciel's soul.

PLOT In Victorian-era London lives a young boy named Ciel Phantomhive. Ciel lives with his wealthy parents in a manor in England. On the night of his tenth birthday, Ciel comes across his mother, father, and dog dead and surrounded by flames. The manor was set on fire, and he is captured by cultists. He is sold by his kidnappers, and then given a mark on his abdomen that's supposed to be the mark of a noble beast. After enduring a month of excruciating and humiliating torture, Ciel unknowingly summons the demon, who he names Sebastian after his childhood dog. 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 inexplicable abilities.

In truth, Sebastian is actually a demon that has entered into a contract with Ciel. In exchange for the boy's soul, the demon will help him exact revenge on those who have wronged him. As the Queen's guard dog and standing at the top of the British underworld, Ciel solves the crimes plaguing London while waiting for the day of his revenge.