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Chisato lives with her husband and son-in-law. My younger sister Shinobu brought her son to such a house. One day, Shinobu witnesses her sister having a lewd relationship with her son-in-law. Feelings welling up in my sister's heart... It was jealousy of my sister's sexually filled life. From that day, Shinobu's masturbation days begin. And the frustrated mother finally had an affair with her son. Jealousy swirling between sisters and parents. Sexual relations that are mixed in mush become intertwined intricately.