Nami, a female teacher with a sweet smile and a voluptuous figure, is assigned to coach the swim team for their summer training camp. Beloved by the students for her warm personality, she struggles with her lack of experience in swimming instruction and accidentally injures several team members. As a result, the students pressure her into giving them handjobs. Their actions are witnessed by both the other team members and swimming coach Sakurai. When dawn breaks, Sakurai offers her a massage, then proceeds to molest and rape her. This scene is seen by the students, leading to further escalating abuse and gang rape.