A few years into her marriage, Minami is a student teacher who, with her husband's support, is working towards her dream of becoming a teacher. Her natural cheerfulness and exceptional beauty make her very popular with her students. But one day, an unexpected nightmare begins when she plays a game of musical chairs with her students. At first, it was just a prank, but when the students touch Minami's breasts and buttocks, they can no longer control their desires and end up violating her. It doesn't end with just one go, and a creampie gangbang drama called musical chairs begins, day and night...