Ibuki and Akira are lured into a fake vacation contest, only to be kidnapped by Shuji and Kazuma and taken to a remote summer resort. Seeking revenge for the girls' disdain at school, the boys subject them to a sadistic "training" regimen of sexual abuse. Despite their attempts to protect one another through self-sacrifice and a failed escape attempt, the two girls find themselves trapped in a cruel game of submission.
Shuji forces Karen to prove her loyalty through a series of degrading trials, while Akagi works to break the will of others. Through psychological manipulation and sexual conditioning, Karen, Akira, and Ibuki are stripped of their autonomy and transformed into subservient slaves. Now fully devoted to Shuji, the girls compete for his favor as they prepare to embark on a new, darker game of submission.