After being tricked into drinking diuretics by her male students' prank, teacher Masami feels an intense urge to urinate during class and rushes to the restroom while secretly leaking. However, a trap has been set there as well, forcing her into a situation where she has no choice but to relieve herself in the boys' restroom. Witnessed in this state, Masami becomes a sex tool for the male students, but she gradually begins to drown in the pleasure of incontinence and humiliation!