As Takeshi Nanase discovers one summer morning, the world as we know it is only half the tale. Takeshi comes upon an unconscious female in a uniform he doesn't know on his way to kendo practice. Takeshi does the right thing and saves her, but in exchange, the girl awakens and mistakenly transforms him into a magic-user. As Takeshi discovers, there are two worlds: his own and that of magic users. Most magic users just wish to coexist peacefully with non-magicians, but some have loftier goals. Mui Aiba is a magician enrolled at the Subaru Magic Academy, which teaches magic users how to control and channel their powers, as well as how to coexist peacefully with normal people.