The other day Ryo returns home in his human form and goes to school. When a student is murdered, Ryo suspects it was a demon's deed and wonders if the culprit is himself. But at night he sees a demon attacking a human and kills it by transforming himself into a half-demon, half-human figure. During the same night, a Medusa-like demon appears in the city. At school, another student, , says he fights demons and that he wants Ryo to be his partner. As Sosuke shows a demon to Ryo and tortures it, Ryo feels compassion for the demon. Unsettled, Ryo leaves the place and meets , who takes him to time travel.