The performance of the construction company that her husband Masao was running deteriorated, and Ozawa decided to buy it. Masao is in charge of sales and Yurine is to work under Ozawa as a secretary, but Yurine has a secret. That was because when her business was in trouble, she took on a large amount of debt. When she discusses this with Ozawa, he agrees to become her mistress in exchange for lending her money. And Ozawa is his secretary's day