After losing her husband, Ayumi Shinoda runs a boarding house on her own. She runs the place cheerfully, despite the attention of everyone drawn to her large breasts. One day, she sees the lodger's erect penis in the toilet and becomes aroused. Unable to contain the throbbing in her vagina, she masturbates in the toilet. However, the lodger sees her and they end up having sex. The widow is intoxicated with pleasure and continues her relationship with the lodger. Then, a white man knocks on the door of the boarding house. "I want to come in here. Is that OK?" The widow's vagina begins to throb again...