Blue ExorcistBlue Exorcist.

Blue Exorcist (Japanese: 青の祓魔師（エクソシスト）, Hepburn: Ao no Ekusoshisuto) is a Japanese manga series written and illustrated by Kazue Kato. The story revolves around Rin Okumura, a teenager who discovers that he and his twin brother Yukio are the sons of Satan, born from a human woman, and he is the inheritor of Satan's powers. When Satan kills their guardian, Rin enrolls at True Cross Academy to become an exorcist under Yukio's tutelage in order to defeat Satan.