A 32-year-old married woman named Saki works as a swimming instructor at a sports club in Tokyo. Every day, she is forced to wear highly revealing, perverted-design competition swimsuits while overseeing male members swimming in the pool. Her body catches the eye of a man named Yoshino, a swimsuit fetishist who frequents swimming classes specifically to target female swimmers. One day, Yoshino deliberately stages a hit-and-run accident with Saki's car, using the threat of a personal injury claim to blackmail her. Yoshino's gaze is constantly fixed on Saki's body, obsessing over the swimsuit designs she wears during lessons and captivated by her beauty. As male members of the sports club gather around and gang rape her, Saki remains the center of attention. The situation creates a strange dynamic where, despite being leered at with lustful eyes, Saki herself gradually surrenders to the circumstances.