Since her husband hasn't touched her since childbirth, unable to bear her prolonged sexual frustration, Koreeda spends her days indulging in masturbation. Her son Akira, captivated by her alluring yet lonely figure, decides on a forbidden act of filial piety—comforting his mother with his body. Koreeda is confused and resists her son's sudden advances, but despite her maternal instincts, her body responds to his caresses. Eventually, Koreeda stops resisting and surrenders to his forceful fondling.