Hitomi Honjo, married to the eldest son of the prestigious Honjo family, seemed to be living a happy life—until it quickly crumbled. Her husband's chronic illness worsened, leading to his sudden death. Grieving, Hitomi is further devastated by his will: he left all his assets solely to her. His younger brothers, Toru and Yuuma, refuse to accept this. They begin to persecute her, seeking complete control over her body. In particular, they become obsessed with her anus, determined to take her anal virginity. Her untouched, unknown back passage becomes their prime target, marking the beginning of a brutal new battle.