Akiko Kirishima, Kouichi's mother, is a beautiful forty-year-old milf whose outward elegance hides a deeply impure nature. One day, when Kouichi's friend stays over at their house, she deliberately exposes herself while changing, enticing the young man with her seductive behavior. Driven by insatiable desire, she continues her shameless advances, unleashing a series of dopamine-fueled erotic acts one after another.