Chisato Shoda is a beautiful mother who has lost her husband and is completely destitute. Chisato showers her love on her son, who is the only child of her husband, but one day, while he is asleep, she becomes aroused by his erect penis. The sexual desire of this ripe mother runs wild! Although she knows that her love for her son is forbidden, she still has sex with her son just to satisfy her desires, and she has sex with him... a forbidden mother-son intercourse.