Yoriko Yabushita (Anne Watanabe) works at a Yokohama research laboratory. She tracks trends in relation to macroeconomics. She is 29-years-old and enthusiastic about her work. She also enjoys efficiency and having a regular life. Although she doesn't excel in social settings with other people, her next goal is getting married and having a baby. Yoriko believes that she marry by the age of 30, because everyone around her did including her late mother. If Yoriko finds a man who fills 24 items listed on her ideal husband list, she will marry him.

Meanwhile, Takumi Taniguchi (Hiroki Hasegawa) is 35-years-old and unemployed. He did graduate from college, but he spends his days reading books and listening to music. He's not interested in dating or getting married, because he knows he lacks a source of income. He lives with his mother and knows that when she passes away, he can't continue his current lifestyle. Takumi Taniguchi then decides to find a woman who is capable of supporting him financially. 

Yoriko Yabushita and Takumi Taniguchi, who both think of marriage as a contract, begin to date with the goal of getting married.

An plays the role of Yabushita Yoriko, a 29-year-old economics expert who holds a Masters degree from University of Tokyo and works in the field of macroeconomics research. She is rigid and refuses to pander to others. As she aims to get married by 30, she registers at a marriage agency in order to find a partner. On the other hand, Hasegawa plays a jobless man named Taniguchi Takumi who depends on his mother for a living while being absorbed in the world of literature, arts, music and entertainment. He regards himself as a high-class nomad and decides to register at the same marriage agency as Yoriko in order to find a rich woman who he can depend on for a living if his mother is no longer around. The two of them who are said to be unable to love and unsuitable for love get paired up together and through a number of dates, become closer to each other while viewing the topic of marriage as a mere contract rather than the union of two people who are in love with each other.