Easygoing and energetic Yamato Akitsuki is prepared to begin his high school life in Tokyo. Invited by his aunt to live rent-free at her housing complex, he accepts her offer without hesitation. However, he is unaware that the boarding house is actually an all-girls dormitory. Upon visiting his new school, Yamato spots a girl training for the high jump. Struck by her athletic ability and beauty, he desires to learn more about her. Fortunately, this girl, Suzuka Asahina, lives right next door to him—but all their encounters so far have given Suzuka a bad impression of him. Despite the constant misunderstandings, Yamato 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 hard in order to win over the girl he loves.