Yuri Fukada, a busty F-cup schoolgirl past puberty, was deeply curious about masturbation and the changes her body was undergoing. While browsing an adult site, she learned about aphrodisiacs and met a mysterious man. But behind him lurked a group of aggressive, lust-driven men. Using the drug, they lure the popular high school girl from her part-time job in an electric town eatery, then take turns fucking and training her. Drawn into wild, hardcore group sex, Yuri awakens her deep masochistic desires. Overwhelmed by relentless pleasure, she orgasms so intensely it feels like her uterus is on the verge of collapse.