16 year old Isogai Yuuki is an average student trying to get by each day of his life without causing any trouble. One day while walking him, he was approached by thugs, and suddenly he went blank as they approached him, when he awoke minutes later the three were on the ground out cold. Startled by the sight, he ran home, that night he had a dream that his shadow was talking to him, only to discover that it was real the next day. His shadow explained that he was from the "shadow world" where beings may only exist as a shadow. In that world, deceased beings from planet earth dwell as they wander helplessly waiting for their regrets to be fu