For being late to class, teacher Manami Nishi assigns track club members Kawashima and Yanagimoto to a week of after-school detention. When track coach Yoshimura requests leniency, citing their potential as key athletes for the national high school championships, Manami refuses. Enraged, Yoshimura conspires with Kawashima and Yanagimoto to corner Manami in the school infirmary and rape her.