"Blue Exorcist" is a Japanese manga and anime series created by Kazue Kato. It follows the story of Rin Okumura, a teenager who discovers he is the son of Satan. After witnessing the death of his guardian, Shiro Fujimoto, Rin decides to become an exorcist to fight against demons and protect humanity. The series is set in a world where demons exist alongside humans, and exorcists are trained to combat them. Rin enrolls in the True Cross Academy, where he learns to harness his powers and confront his demonic heritage while forming bonds with his classmates, including Yukio Okumura, his twin brother.