Fumino is a married woman who has been married to her husband for two years. She is currently living with her husband as a boarder at her uncle's house, who runs a company. Feeling sorry for her husband who cannot find a permanent position, her uncle came to her rescue. Three months later, her husband was relieved that he was still working, but he was troubled by a certain problem. Their nighttime activities had become dull, and he no longer engaged in foreplay. After her husband went to work, she began to pleasure herself alone, hiding from her uncle, but her uncle was aware of her sexual situation. Unable to bear it any longer, her uncle entered Fumino's room where she was masturbating, and started to bite her crotch, which had just come.