青の祓魔師

Rin Okumura grows up an ordinary, hot-tempered teen until he learns he is the son of Satan and that blue flames answer to his blood. After his guardian, the priest Shiro Fujimoto, dies confronting that heritage, Rin draws the demon-slaying sword Kurikara and resolves to become an exorcist strong enough to defeat his own father. He enrolls at True Cross Academy, where his composed twin Yukio already teaches, and trains beside other apprentices while hiding what he really is.