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Married Woman Auction Club where anal lovers gather. Nachi was also a product of the club due to the enormous debt left by her husband. Nachi waits for the help of her husband, who never comes, in a prison that is covered with straw as if it were a cow. The anus is forcibly expanded, and preparations for the exhibition proceed smoothly from the worm inspection to the expansion without any time to feel embarrassed. Then, with a large number of guests rushing in, the nightmare-like finally begins...