Masumi Ooshiro lives with her husband, who has remarried, and his son from a previous marriage, Yoshihiro. One day, Yoshihiro rapes her, records the act, and threatens to release the video unless she complies. Helpless and unable to resist, Masumi endures relentless abuse. When her husband leaves on a business trip, she is further assaulted by Yoshihiro and his friends. Gradually, her will to fight back fades away, and she begins to thrust her hips forward on her own, passionately craving more.