From a quiet library to a school-wide nightmare: A platonic promise shattered by a teacher's blackmail

My Bookworm Girlfriend Was Seduced by a Stud P.E. Teacher: Students Raped & Turned Her Into a Masochistic Sextoy, Overwhelmed by Endless Orgasms & Creampies

The story follows Miyuki Arisaka and her boyfriend, who bond over a shared interest in literature. The plot transitions into a drama involving a physical education teacher named Okazaki, who uses recorded footage of an incident in the library to influence the couple's relationship. The narrative explores the subsequent breakdown of their platonic agreement and the involvement of other characters within the school setting.