Just before entering Seishuu High School, track star Katsuya Niimi and judo champion Susumu Karasawa witness a girl crying as the school loses a baseball game. The boys decide to join the team and improve it to make her smile. The girl turns out to be Yuri Nakao, daughter of the baseball coach, and they learn the baseball team will be shut down if it doesn't start winning. The series follows the three, as well as pitcher Eiji Kurahashi, as Niimi and Karasawa learn about baseball and what it means to be one of nine players on a team, as they work together through high school to make it to Koushien.