Namiki Kohei (Nishijima Hidetoshi) is a somber, single man in his 40s. He is the type whom the people around him can force impossible demands on and is always made to take care of the three children of his older sister Yukiko (Ikuta Tomoko). Although he sought to be an astronomer, his family situation and finances did not allow him to embark on it and he had to give up his big dream to “discover his own star”. And so, Kohei works part-time at a security company and becomes the personal bodyguard to Han Yuna (Kim Tae Hee), a big South Korean star who has come to Japan for filming. The perfect Yuna is a celebrity adored by all. However, she is actually an ordinary person who loves cheap, everyday Japanese food and feels lonely in the entertainment world that she lives in. Even though Kohei and Yuna cannot completely understand each other’s language, he is deployed to guard her for a period of 99 days. At first, the two of them clash, but the distance between them gradually shrinks, and they find themselves supporting each other’s dreams. Kohei suddenly falls in love with her, a woman who is so close but yet so far. After the end of the 99-day contract, what choices will they make on the 100th day?