Junko, a transfer student, soon became popular with the boys, and a competition began for Junko, who was thinking of joining a sports club. Junko was torn between the swimming club and the gymnastics club, but she decided to join the gymnastics club on the advice of her homeroom teacher, Ishida. When Mita, a member of the swimming club, learns of this, he conspires with his classmates to rape Junko in the locker room. Frightened, Junko decides to refuse to join the gymnastics club, but is attacked by Kawamoto, who misunderstands that she was being teased.