30 years ago, Meisei High School's baseball team won the much sought after Koshien Tournament, but haven't come close since. As the new school year at Meisei Junior High School begins, brothers Touma and Souichirou Tachibana start practicing in secret.

Otomi adopts a dog and names him Punch, as the Meisei baseball team debates who should be the club's ace pitcher.

The Meisei Junior High team progresses through the prelims of the national juniors by the skin of their teeth. Souichirou's battery relationship with his brother also begins to be explored.