Murakami Naoki, a third-year student at Hakodate Koyo High School, is a young man blessed with handsome looks, a brilliant mind, and exceptional athletic ability. One day, Murakami is taken by his friend Sano to watch a match of the girls' tennis club from the same high school. There, he falls in love at first sight with Mizuno Haruka, who is playing in the match. The very next day, he confesses his feelings to her, and their relationship begins.