Owen, a high school senior, is introduced to the art of demon slaying. When his world collides with a secret organization that monitors all supernatural activities, a whole new world is opened up to him. Everyone has demons surrounding them every day trying to coax them into doing evil. He begins to see how people's lives are meddled with and destroyed by these creatures. Along the way he meets Marth, a seasoned Exorcist, and Emiko, an old friend from school. Under the tutelage of Marth, Owen is taught new skills and abilities that he will need to destroy these monsters. Amongst all of this, he unknowingly stumbles upon a plot to destroy his local town and soon the world. Is Owen ready for such a challenge?