DVAJ-642 A teacher uses a used napkin to track ovulation and blackmails a shy student. Maika Hizumi

Maika, a shy female student, is shown videos of herself changing and using the toilet by a teacher who regularly gropes her. He threatens to spread the footage, and the abuse turns into daily sexual assault. He forces his cock into her throat and thrusts into her roughly, while she endures in silence. After recovering a used napkin she threw away, he calculates her ovulation day and keeps using her, even as her body, trained by his relentless handling, responds against her will.