Naoko Adachi is a Milf whose husband has grown distant, leaving her to find pleasure alone through masturbation. Unaware that her son Kazuya is deeply troubled by the thought of her seeking intimacy with other men, she continues indulging in daily self-pleasure. One day, Kazuya offers to satisfy her himself. Though initially hesitant, Naoko gives in as his touch feels surprisingly good, eventually leading to full incestuous sex between mother and son.