Rin was a former competitive swimmer, but her ex-boyfriend at the time was a jealous and controlling type. He didn't like the fans who flocked to Rin's competitive swimsuits, and before long they started fighting and the couple broke up. After being dumped, his ex-boyfriend became an obsessive slut, and Rin fled to the countryside. Five years later... one day, while working as a personal swim trainer at the gym she moved to, her ex-boyfriend showed up with a video of him having sex with her that was taken against his will! Rin's weakness is exposed and she is repeatedly raped by her sadistic ex-boyfriend, who forces her to wear an extremely high-cut swimsuit...