Fumie, a fifty-year-old married woman, has been living alone since her husband was transferred for work, only able to see him during Obon and New Year. Unable to suppress her sexual desires, she gradually fell into the habit of masturbating regularly. Her late-night self-pleasure sessions slowly became an ordinary part of her daily life. One morning, while going to wake her son Wataru, she found him lying there with his lower body completely exposed, his cock fully erect in a morning hard-on. Fumie was struck by shock and confusion at the sight.