Female college student Aoi inherited her deceased grandfather's ability to see ayakashi. One day, while Aoi is feeding some ayakashi, a demon appears! He declares that Aoi's grandfather owed a great debt, and as compensation, Aoi must marry the demon! Aoi refuses, and decides to pay off the debt by working at the inn of the afterlife, the Tenjin-ya.

Makia is a noble lady descended from an infamous witch. Thor, a boy who was raised with her and came from another world, is chosen to be the knight of the "savior." The two are forced apart and to see Thor once again Makia aims to be the top student at Magic School!