Nobuko's loneliness had reached a critical point. Since the birth of their only son, Takashi, her indifferent husband had paid less and less attention to their marital relations, leading to a long period of sexlessness. Unable to bear it any longer, Nobuko becomes aroused as she masturbates. By chance, Takashi happens to be passing by, and seeing Nobuko's lewd and lonely appearance, he becomes troubled and wishes to somehow help his mother. "Maybe I'm not enough to comfort my mother..." Touched by Takashi's kindness, Nobuko ends up having sex with him, even though she knows it's wrong. Nobuko is completely captivated by Takashi's prodigious sexual prowess... and she can't be apart from Takashi even for a moment.