Young, innocent schoolgirl Shion has a soft, tight body that drives school swimsuit maniacs wild. The snug fabric of her sailor-style swimsuit clings to her plump, curvy figure, becoming the ultimate object of desire for these obsessed collectors. During a swimming class, a perverted voyeur secretly films her, transforming her image into a target of uncontrollable lust. The maniacs have a specific fetish—they assault her without removing her swimsuit. Recording every act, they use the footage to blackmail Shion, dragging her into an endless, cruel cycle of gang rape and torment.