Son Makoto strongly opposed his father's remarriage, but when his father married Nozomi Hazuki, a new family life began. One day, Makoto discovers that Hazuki is having an affair with a lover, causing him to grow jealous and resentful. These emotions intensify over time, leading him to make sexual demands on her. Makoto's sexual desires become focused on his stepmother Hazuki, who is gradually reduced to a mere sexual outlet for her stepson. Under the control of her son's cock, Hazuki endures humiliating and sadomasochistic acts—submitting to bondage, incestuous domination, and degrading treatment—experiencing both torment and perverse pleasure. As their twisted relationship deepens, what emotions will emerge between them, and what kind of conclusion will they reach?