Hanamori Yuiko, the daughter of an automobile manufacturer, is ordered by her grandfather to enter into a political marriage for the development of the family business. In order to fulfill her duty, Yuiko goes on a blind date with Ayato Shirahama, a sergeant in a large company, but is rejected on the spot. When she is stunned, Ayato says, "I've changed my mind, I'll marry you. But..." He offers a condition...! The two are now living together as prospective fiancées. At first, Ayato is a bully, but he is moved by Yuiko's single-minded love, and Yuiko is also touched by Ayato's kindness, and they gradually become attracted to each other...