Azumi was satisfied with living in a happy family, but she wanted more extreme stimulation in the night life with her husband. However, she didn't have the courage to say it out loud, and her frustration led her to spend days indulging in masturbation. One day, she will be peeping at her masturbation by her brother-in-law, Koji, who lives with her. Koji threatens Azumi and makes her his sex slave. Koji, who noticed that her Azumi's body is soft, relentlessly demands play that makes full use of her sister-in-law's soft body. Azumi also reacts more and more to the pleasure that cannot be obtained from sex with her husband. Thus began her forbidden days of fornication.
