Mikuru arrives at Tanbi-kai as a virgin who has just lost her virginity, yet surprisingly displays intense masochistic tendencies. Though she has the cute, innocent look of a young schoolgirl, she harbors a hidden fascination with BDSM. Subjected to relentless torment, her small nipples are teased, her thighs are forced apart, and her pussy is thoroughly broken in. She begins screaming in a high-pitched, childish voice, her face twisting and distorting under merciless nose torture. The sado-masochistic girl, now with a pig nose, is properly trained as a "schoolgirl toy" for the pleasure of dominant men. Throughout the process, she undergoes various training methods including nose-ring dog dragging, vibrator insertion, anal play, and enemas. Her body gradually opens up under the unrelenting abuse. This experience marks her first step into the world of SM, testing and deepening her innate female masochism.