The Niimura family, a mother and son living peacefully after the father's death in an accident. The mother, beautiful and kind, becomes the envy of all as talk of remarriage arises. While the son feels conflicted, he grows furious at the thought of his mother with another man. The word incest begins to shadow their household. As the mother grows intimate with her new partner, the son is crushed by humiliation. Then, catching his mother alone, indulging in masturbation, he gives in completely to his suppressed emotions. This work delivers a shocking story, deeply exploring the bonds of family and the turmoil of love and hatred.