The Fujisaki couple received special favors from the husband’s junior colleague in college, helping them secure new employment and escape financial ruin. However, this junior was actually someone who had been bullied by the husband during university and secretly harbored deep resentment. While the husband is drunk and unconscious beside her, he inadvertently reveals the truth. Seeking revenge against her husband, Aoi is forced to submit completely, being repeatedly raped by the man. From that point on, whenever her husband is away, she becomes trapped in a daily life of sexual training, gradually sinking deeper into the pleasures she once resisted.