In this adult school-swimsuit humiliation scenario, teacher Jun Kasui is targeted by a perverted older supervisor obsessed with tight swimwear. Assigned as an assistant swim-club adviser, she is forced into her first school-style swimsuit in ten years, then blackmailed with voyeur footage, raped through the shifted crotch, and creampied. Soon she must wear it beneath her suit during class so he can pull it aside, penetrate her immediately, and mark her with semen as humiliation and shame twist her face.