From FairGame (JCafe24):

In a certain baseball field, Tachibana Youki took three consecutive strikes from genius batter that later in future will become star that'll win Spring and summer koshien in rows. Youki is zinger pitcher that throws fast ball that is suprisingly stretch in front of batter, and he goes to saiyou high school that has baseball team that can't be say as strong, to take his childhood friend, Sawamura Rin to Koushien.