Widowed and running a small greengrocery with her son Takashi, Kaoru lives a quiet life. Though timid, Takashi is honest and deeply cherished by his mother. One day, Takashi is caught stealing women's underwear at a delivery destination—the Mizuno household—and is brought back by Kenichi Mizuno. Kenichi, with his mature and intimidating demeanor, blackmails Kaoru, forcing her to change into the stolen lingerie and humiliating her by groping her body in front of her son. Enduring the shame, Kaoru secretly begins to feel arousal, deliberately exposing her pleasure to Takashi. Witnessing his mother's degradation, Takashi's young penis grows hard and erect... This scene, adapted from the original work "Unfit Mother: My Son's Sow-Cuckold Sex Education," portrays the shattering of familial bonds and shocking developments that provoke intense emotional reactions in the audience.