Kokono Isanao and her son are constantly at odds, their relationship more like enemies than family. As usual, they're bickering again today, and after being relentlessly teased about his virginity over LINE, the son is left humiliated with no comeback, forced to flee in shame. The mother mocks him as he runs away, but that night, he returns seeking revenge. Overpowering her resistance, he pins her down and uses her body for his pleasure, turning her breasts into a flesh toy. Her pride as a mother crumbles along with her body, and as he thrusts into her with seductive strokes, humiliation slowly transforms into pleasure. Through this act, their relationship takes a dark, irreversible turn.