A beautiful mother, Marina Matsumoto, teaches her son about sex education as he begins to awaken to it, but the mother is also starving for a man and spends her days getting aroused by the sight of her son sleeping and his underwear. Unable to resist their sexual desires, the mother and son end up having sex. They show each other how they masturbate, share affectionate love, and indulge in sex. A forbidden domestic act unfolds in digital format.