Koji Yusa

The atmosphere in True Cross Academy is lively and boisterous in the days leading up to the grand festival held once every 11 years. During this time, Okumura Rin is entrusted with the responsibility of suppressing the berserk Phantom Train. In the midst of his mission, he meets a devil whose appearance is that of a young boy.

Humans live in the world of Assiah, demons in Gehenna. The two dimensions are not meant to interfere with each other, but demons still possess creatures in Assiah in spite of this. The humans who can fight these demons are known as exorcists. Rin Okumura is a boy who bears the curse of being Satan's illegitimate son. His foster father sacrificed himself to save him from demons. To avenge his foster father's death as well as to prove himself, Rin decides to follow the path of an exorcist and defeat his own father, Satan. To hone his raw skills, Rin enters True Cross Academy to train with other exorcist candidates.

Andy, a Negator with the ability "Undead," has been long in search for someone with the ability to give him a 'real death.' Fuko Izumo brings misfortune to those around her due to her ability "Unluck." The two decide to join the Union, an organization which aims to control and protect the world from unidentified phenomena. The two uncover the mystery of the world as they search for the "greatest death ever."