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A certain city in the northern Kanto region... Sumire, a chaste housewife who has been married for three years, lived peacefully with her hard-working office worker husband. Sumire spends her days looking for a new home and previewing various real estate properties in the city on weekends, partly because the current rental apartment she signed when she got married has become a little cramped. The sales man of the real estate agent who was in charge of the preview of the property had a bad feeling about such a beautiful married woman. One day, the salesman couldn't bear to persevere at the property being previewed, which was basically a closed room for just the two of them...!