Ayumi, a beautiful high school teacher, is the object of admiration for her male students. However, one of them finds out that she is working as a model on the side. Ayumi is forced to wear the high-cut swimsuit she wore in her modeling photos even in the classroom. With the obscene costume digging into her crotch, she is subjected to a humiliating public sex lesson while being watched by the whole class. "Quiet... please be quiet," "There's no way we can be quiet, teacher." The students' desires escalate day by day...