The story is about Okumura Rin. He's a teenage boy hows possesed with a abnormal strength. He is raised by Father Shiro Fujimoto. He also have ayounger twin brother named Yukio. Soon after Yukio departs to study at the prestigious True Cross Academy, Rin learns that both he and his brother are sons of Satan, the strongest of all demons. Father Shiro Fujimoto dies when he protect Rin from Satan. Rin do what he's guardian asked him to never do - draw the demon-slaying blade named Kurikara. This sword releese his demonic powers. From that moment on, Rin gains permanent demonic features like fangs, pointed ears and a tail, but also the power to ignite himself into blue flames that can destroy anything it touches.

Insted of follow Satan, he's father, Rin decide to become a exorcist like Father Shiro Fujimoto and defete Satan. With a little help from Mephisto Pheles, Rin become a student of True Cross Academy.

Mephisto Pheles is a close friend to Father Shiro Fujimoto but also the head of the True Cross Academy. True Cross Academy is actually the Japanese branch of an international organization dedicated to protect the human realm, Assiah, from demons and other creatures from the demon realm, Gehenna.

Rin takes part on the special Exorcist course only known by a few. But to his suprice, he findes that his brother Yukio is already a veteran veteran Exorcist and will be one of his teachers.

Okumura Rin

Okumura Yukio

Mephisto Pheles

Father Shiro Fujimoto

Okumura Rin when he draws his sword