A certain city in the northern Kanto region... Sumire, a pure housewife who has been married for three years, lives peacefully with her hardworking office worker husband. Sumire spends her days looking for a new house and previewing various properties in the city on the weekends, partly because the current rental apartment she signed upon marriage has become a bit cramped. The real estate agent's salesman in charge of previewing the property has a bad feeling about such a beautiful married woman. One day, the salesman can't bear to persistently look at the property, which is basically a closed room for just the two of them...!