Miki is the advisor for the swimming club at the school where she has been assigned, and looks after the students. She is beautiful, has an incredible figure, and is a popular teacher who is caring. One day, a student confesses his love to her seriously, and although she is hesitant, she politely turns him down. This incident earns her the wrath of the students, and she is forced to wear an obscene competitive swimsuit, with her breasts completely exposed. During club activities, she is gang-raped by the pool... The cocks of the sexually ravenous male students never seem to calm down, and a never-ending gang-rape relay begins!!