The Kuromiya couple run an inn in a hot spring resort in northern Kanto. They have known each other since childhood, and the wife, Eimi, has been a popular beauty since her student days. One day, the couple's classmate, Nakao, contacts them. Nakao is now the young president of a construction company that has been in business since his parents' generation, and he brings along some guys from the company. However, his real purpose is to deceive Eimi and pin her down in front of Yusuke...