Mr. and Mrs. Kodama run an inn in a hot spring resort in northern Kanto. Rena, the wife, married Yugo, who was her boss when she was an office lady. Yugo later took over his family's inn, and now the couple runs it together. However, due to the recession, the business is in dire straits. Furthermore, Kawagoe, a man who had been working as a servant at the inn since the previous owner, is causing the couple a lot of trouble. One day, Kita, a loan shark from whom Kawagoe had borrowed money, comes to demand repayment. In a panic, Kawagoe comes up with the worst possible idea: to offer the body of Rena, a beautiful woman with big breasts.