Yomi is one of the rulers of demon world who seeks unification of demon world. He Yoko Kurama right hand man but continue go against him that which led to his faith. A myseriuos demon blinded him sent by Yoko Kurama. Now, he call his old friend, Kurama, back to demon to be his right hand man and help unify demon world. He found the demon that stole the light from him.