Kunimi Saya

Ryou's classmate and one of the top-ranking students in the school (in terms of grades). She is popular with boys and the teachers trust her a lot. Because she keeps her private life enveloped in a veil of mystery and rarely goes out with her friends, girls who are jealous of her have been circulating rumors of Saya participating in compensated dating.

Spoiler

Saya is the biological child of the killer, and is the one spraying graffiti across the town. She dies in Akemi's route.