Kumi Kanzaki is a devoted mother to her son Ichiro, who harbors intense feelings for her. Unable to control his desire, Ichiro secretly watches her, sniffs her underwear, and frequently masturbates thinking about her. Desiring to get closer to his mother, Ichiro devises a plan to lure her out by asking a friend to gather private information about her. Unaware of his scheme, Kumi falls right into Ichiro's trap, leading to an unexpected and intimate encounter between them.