Mikoto is an average school girl, but actually is the figure of Asura after getting sealed by Yama. She spends her days accomplishing missions to fight against demons. One day, she saves a boy who was getting beaten by the chefs for running away without paying for what he has eaten. Unfortunately, the boy was possessed by a ghost that Yama was looking for. Yasha, the guardian of the Sky, hears about this and concludes Mikoto wasn’t doing her job. Yasha decides to deprive the qualification as a Slayer and makes Yama summon her to hell.