Kentarou Uzaki is a very traditional father who, after the passing of his wife Yoko, doted on his daughter and worked hard to raise her, Aiko, into adulthood. The father-daughter duo relied heavily on each other, sharing an excellent relationship. However, even though Aiko is 20 years old, her father still treats her like a child. His excessive care begins to greatly bother Aiko. On her first day at the OBECA Design Company, Aiko's father once again troubles her with his excessive enthusiasm. On her second day at work, the careless Aiko receives a severe reprimand from Minister Shunichi Narumi, who has just returned to the country. This leaves Aiko feeling quite defeated. Over the weekend, Aiko joins her colleagues at a new product launch party for a children's clothing brand. Naive Aiko plays a game with the designer's son and ends up completely messing up his clothes. Both the designer and the department manager, Madoka Makihara, become extremely dissatisfied with Aiko. Unable to tolerate his daughter being criticized, Kentarou stands up for her and unilaterally submits his resignation to the company. Aiko is very upset with her father's actions, but Kentarou insists that he will continue to treat Aiko as a child until she gets married. In order to escape her father's restrictions, Aiko falsely claims that she has a romantic interest and plans to get married...