Black Butler 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, a thirteen-year-old boy, head of the Phantomhive household, an aristocratic family known as the Queen's Guarddog. He is 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.