After being tricked by a male student into drinking a diuretic, Masami, a female teacher, feels a strong need to pee during class and rushes to the bathroom while secretly wetting herself. However, a trap is set up there as well, and she is forced to relieve herself in the boys' bathroom. She is seen doing this and becomes a sex toy for the male student, but she gradually becomes addicted to the pleasure of incontinence and rape!