At Satogahama High School, freshman Tsubasa Arihara interrupts the entrance ceremony to promote her newly-formed baseball team, though its small size and obscure status render it an association with fewer funds than a club. She and best friend Tomoe Kawakita invite classmates Yüki Nozaki and Akane Ukita to sign up, but are reluctant due to their lack of confidence. The girls play a pick-up game with other kids, and despite their struggles, Yüki and Akane agree to join the team.