Kou Kitamura and Aoba Tsukishima frequently clash, despite their families being close friends and business partners. Although Kou is the only child of a sports shop owner, he has never shown interest in playing baseball. Nevertheless, he possesses impressive batting skills, refined through regular visits to the local batting center operated by the Tsukishima family. Conversely, Aoba is passionate about baseball and is a star player with exceptional pitching form. However, these two apparent opposites share something vital to them: Wakaba Tsukishima, Aoba's older sister and Kou's destined sweetheart. Admired by the quarrelsome pair, Wakaba often becomes the catalyst for their endless rivalry. Whether they realize they have more in common than either would admit remains to be seen. Baseball may well be what the duo needs to ultimately overcome their personal struggles.