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Mr. and Mrs. Tsuruta moved to their husband's parents' house to purchase their own home. My father-in-law, Bungo, who divorced at a mature age, lives alone in his parents' house, and he was willing to accept them. One day, when her husband is alone on a business trip, his amorous father-in-law, who has been looking for opportunities for a long time, pushes down Mai. I don't know that my father-in-law's desires will stay, regardless of the fact that Mai is forcibly related and sinks in deep sorrow. From this day onward, the happy life changed completely, and the days of shame that my father-in-law played with began.