A four-part anime hentai series. Takui's father dies in an accident during an experiment. Worried about the fate of his young stepmother, Takui follows her to a place called Ken. There, while following her and her best friend Mitsuki, he is stunned by the sudden transformation of a beam of light into an incomparably beautiful girl. This mystical creature put a ring on his hand, which served as the beginning of Takui's fantastic journey into a parallel world...