Easygoing and energetic Yamato Akitsuki is ready to start his high school life in Tokyo. Having been invited by his aunt to stay rent-free at her housing complex, he unhesitatingly accepts her offer. But unbeknownst to him, the boarding house is actually an all-girls dormitory.

Upon visiting his new school, Yamato catches sight of a girl training for the high jump. Amazed by her athletic ability and beauty, he yearns to learn more about her. To his fortune, this girl, Suzuka Asahina, lives right next door to him—but all of their encounters thus far has given Suzuka a bad impression of him. In spite of the constant misunderstandings, Yamato still joins the track team with the intent of impressing her and soon discovers he has the potential to become a top hundred-meter sprinter. With friendship, and possibly love on the line, Yamato trains his heart out in order to win over the girl he loves.