After losing his devoted wife to cancer, the father-in-law, desperate to fill the void, turns his attention to his son's wife, Iroha, selecting her as his new subject for training. To Iroha, the couple had always seemed like the perfect marital ideal—but in truth, their bond was built upon tight bondage and domination. To replace his deceased wife, the father-in-law binds Iroha with coarse ropes and begins treating her like a dog. While her husband showers, unaware of the brutal deep throat session happening just beyond the door, Iroha unknowingly eats an eggplant that had been inserted into her pussy. Soon after, her husband dies in a tragic accident, leaving Iroha in mourning, forced to endure even more intense training while still dressed in her funeral black. Now, no one remains to stop them.