Ai Mukai and Yusuke met while working together at a company and both moved towards marriage. They bought their own house with a loan amount and have a very happy life together. One day, Ai unexpectedly met her former boss, Ota, who had lent money to both of them to buy the house. The couple treated Ota very warmly when he came over for a visit. Although he was older, Ota was still unmarried; he was not lacking in money, but what he lacked was a wife. Seeing Ai sparked a desire in him, and he wanted to have sex with Ai every day to erase his debts.