Narihira Takeru is a delinquent who often thinks about Tsukimiya, the girl who appears in his dreams. After an unexpected accident, Takeru finds himself in a parallel universe, and the world that Tsukimiya lives in. When Takeru and Tsukimiya are slain by a monster, he awakens again and realizes he has leapt through time. Now, Takeru must train with Abe Seimei to fight for Tsukimiya's life!