A quarter-demon, deformed because of his heritage, who lives in Daijin and works as an exorcist with his grandfather. He has social and mental problems because of mistreatment by the people of Daijin, but wishes to grow as a person despite that, and happily takes Aya as friend. Unfortunately, the dark forces that surround Toru's life have other plans for him.
A normal high school student originally from Kyoto, Aya always wanted a life of adventure. She gets way more than she asked for when her family moves to the demon infested town of Daijin. With Toru's help, she wishes to be able to fight back against the forces of Hell as well.