"Black Butler" is a Japanese manga series created by Yana Toboso. It follows the story of Ciel Phantomhive, a young nobleman who makes a pact with a demon named Sebastian Michaelis. In exchange for his soul, Sebastian serves as Ciel's butler, helping him seek revenge against those who wronged him. Set in Victorian England, the series blends elements of fantasy, mystery, and dark humor. It explores themes of loyalty, power, and the supernatural, as Ciel and Sebastian navigate various challenges while uncovering secrets about their pasts and the world around them.