A newly established all-boys school hires its first and only female teacher in training, Hasegawa sensei. Inexperienced and unable to assert herself against the aggressively curious students, she is saved from an uncomfortable situation by a male student named Satou. Grateful and attracted to her rescuer, Hasegawa begins to pursue Satou, and the two start a clandestine, sexually charged relationship that blurs the lines between victim and predator. The narrative follows Hasegawa as she simultaneously becomes a target of other predatory faculty members and transitions from a vulnerable position into the dominant, initiating force in her interactions with Satou. The story unfolds across a series of episodic encounters that frequently blur the boundary between reality and fantasy, making it difficult to distinguish actual events from imagined scenarios. The central conflict revolves around the taboo student-teacher dynamic and the repeated insistence that the relationship cannot continue, despite the characters engaging in sexual acts almost every time they meet. The narrative arc concludes with the couple breaking up. In the aftermath, Hasegawa holds onto a napkin that Satou used to clean himself as a keepsake, using it for her own gratification over the following four years, a final act that underscores the obsessive and unresolved nature of their connection.