Forty-year-old sex machine Rieko. Unable to control her growing lust with age, she uses her husband's overseas transfer as an excuse to engage with various men. She begins relationships one after another—starting with the delivery man, then the neighbor's husband who came by with a community notice, and a casual partner she met through social media. But her uncontrollable desire goes even deeper, ultimately leading her to seduce her own virgin son. A shocking story depicting an unrelenting chain of impulse and desire.