In this world, there exist demons that hide amongst mankind. The Demon Hunting Corps specializes in hunting these dangerous monsters down. Ten years ago, the legendary chosen one of the Demon Hunting Corps, Kurahara Haru, defeated the Demon King Ozen in combat, and hasn't been seen since. Aidan Crow is a student at the Demon Hunting Academy with a problem; he doesn't posess any magical ability of any kind. Lacking the potential to become a Demon Hunter himself, he lazes about, putting in minimum effort, till one day encountering a demon...