The new Koshigaya Nine, having held the summer prefectural representative Sakura to no hits with the combined pitching of Eifu and Hikari, advances to the Best 4. Their next opponent is the spring prefectural representative, Misono Academy. Amidst the relentless heat of the matches, Yoshino has devised a secret strategy... to not swing at any breaking balls!? If they win, they will advance to the Kanto tournament! The autumn is hotter than summer and continues on!