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Black Butler is a Japanese manga series written and illustrated by Yana Toboso. It has been serialized in Square Enix's shōnen manga magazine Monthly GFantasy since September 2006. The series follows Ciel Phantomhive, the twelve-year-old Earl of Phantomhive serving as the Queen's Watchdog. He is tasked with solving crimes in the underworld of Victorian-era London. Ciel has formed a contract with demon Sebastian Michaelis, who disguises himself as his butler, to seek revenge on those who tortured him and murdered his parents. In exchange for his services, Sebastian will be allowed to consume Ciel's soul.