Chika Hirako, the idol of the swim team, possesses a gorgeous ass that radiates allure even through her swimsuit. Behind her back, an intoxicating, seductive charm lingers—one that drives men wild. The substitute male members expose her ass in public and mercilessly tease her anus outdoors. Her resistance is weak, and when the men realize she's subtly enjoying it, they recognize her as a true masochist. Through extreme acts like outdoor anal play, public enema injections, forced defecation viewing, and double penetration in the club room, she is trained into a three-hole perverted slut. In this brutal world, her beautiful ass and seductive charm are fully unveiled.