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A younger brother and his wife who decided to stay with their older brother who came to Tokyo because of work. My younger brother-in-law, who I met for the first time in a long time, is a brother-in-law whose lascivious heart raises his head. A brother-in-law who urges her husband, who neglects his wife for work, to push the lonely feelings of his younger brother-in-law who wants a child. The sex of a woman whose body reacts even if she knows that it is a good idea. From that shock, the sexual desire that was sleeping in the younger brother's wife awakens, and in the daytime when the husband is absent, he falls into a relationship of repeating raw squirrel mating with his brother-in-law.