Kouichi, who can't stop thinking about his voluptuous stepmother Sumire, takes advantage of times when his father is absent to approach her. Recently, Sumire has been sexually frustrated due to her husband's busy work schedule and becomes highly sensitive when Kouichi touches her breasts!! Enchanted by Sumire's large breasts, Kouichi can't contain his excitement and ends up having a relationship with his stepmother... Since then, the two continue their relationship in secret from the father, becoming engrossed in their forbidden bond.
