Two boys save high school student Naoko Shirasawa when she almost drowns in the sea during the summer. The boys, Koji Makimura and Ryo Doi, were third-year students at the school she transferred to! The bright and cheerful Makimura, known as the school's noble, and Doi, who has dark and lonely eyes. Naoko thinks that they are like the sun and the moon. At first, Naoko was attracted to Makimura, but gradually began to worry about Doi. How will the relationship between best friends Makimura and Doi change over Naoko?