Alto, who attends the Ortigia Magic Academy, was in danger of repeating a year because he could not contract with a familiar. He was the first to successfully summon a book of summoning magic that he found by chance, but what appeared was the sealed "devil" Vermei. Alto decides to go to the academy with Vermei who became a familiar, but his childhood friend Lilia is furious. It develops into a duel between familiars.