Kohi, assigned to a school as the swim team advisor, watches over her students. She is beautiful and has an excellent figure, caring and popular among teachers. One day, a student confesses his true feelings to her, and although she is bewildered, she politely turns him down. This incident, however, earns her the resentment of the students, who force her to wear lewd swimsuits and expose her breasts. During club activities, she is gang-raped by the poolside… The male students' insatiable lust knows no end, and a never-ending gang-rape relay begins！！
