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棒球大联盟
第三季故事以吾郎在海堂高中棒球部二军和二军的队友们同心协力在饯行赛中打败海堂一军，吾郎自动退学为始，展开了吾郎追寻梦想追求挑战的新的棒球生活。吾郎转读仅有8个男生的圣秀高中。在他的努力下，终于亲手建立了圣秀高中有史以来的第一个棒球部，队员中有清水的弟弟清水大河，有曾经吊儿郎当但受到吾郎投球感动的藤井，也有因为父亲的阻挠而几乎放弃棒球却被吾郎唤起斗志的田代，还有完全没有打过棒球运动神经超差但是因为吾郎的真诚而决定助吾郎一臂之力的各位菜鸟，吾郎与这些队友们一起练习，一起为棒球流血流汗，终于在高三迎来了高中棒球夏季联赛。为了打败海堂，吾郎他们面临众多强有力的挑战者，有好朋友小森、山根所在的三船高中代表队，有超强组合香取、唐泽所在的久里山高中代表，吾郎他们能够打败这些强队，从而获得挑战好朋友佐藤寿也所在的海堂一军的机会吗？……
Goro leaves Kaido High and considers transferring to Mifune High, but he reconsiders after watching Mifune dominate a preliminary match.
Goro tries to form a baseball team at Seishu High, but gets a cold response from the other boys. He receives support from a girl named Nakamura.
A losing streak has Shigeno in bad spirits. The school chairperson tells Goro that she can't approve of a team until he has teacher supervision.
Baseball club supervisor Yamada nets a practice match with Teijin High. Goro leads the team with his fast pitching but things take an unexpected turn.
Seishu ties the game with Fujii's hit, but Tashiro is still not satisfied. Goro speaks honestly after Yamada asks him why he's taking such a gamble.
Goro's team begins training. Shigeno shows up as a temporary coach but an intentionally harsh practice session causes most of the team to quit.
Under Shigeno's coaching, the team begins training in earnest with the goal of winning a preliminary game by spring. A new guy shows up at practice.
Seishu plays a practice match against Kaido's reserve team. They struggle with the opposing pitcher and fall behind thanks to some poor fielding.
Goro is dejected when he hears it will take three months to recover from his injury. Kaido High's chief manager Egashira visits him in the hospital.
The team is excited to play Yoka High in the first round of the tournament. Looking healthy, Goro throws a perfect fastball in practice.
After a fierce seventh-inning comeback, Seishu trails by just three points. Despite his injury, Goro takes the mound in place of an unmotivated Taiga.
The doctor tells Goro that his career is in jeopardy if he keeps playing hurt. Goro appears to take his advice but secretly looks for other options.
Seishu faces Mifune High in the second round. Taiga loses his focus as Mifune breaks the deadlock to take the lead in the bottom of the fourth inning.
Mifune has no outs and a batter on second base in the bottom of the sixth inning. Thrown by Mifune's unexpected tactics, Seishu falls further behind.
Goro takes the mound in place of Taiga with two outs and the bases loaded. Komori is flustered by Goro's fastball, which looks to be at full strength.
After pitching a no-hitter in the third game, Goro catches the attention of Yokohama Blue Oceans scout Katsuragi, who proposes the team draft him.
Scouting the competition, Goro is taken aback by the improvement of their next opponent, Kuriyama High. Later, he runs into Katori before the game.
The game with Kuriyama High nears its end. Karasawa hits a two-run homer to take the lead and Katori corners Seishu with two outs in the ninth inning.
Tashiro pushes the team hard during training ahead of its match against Kaido. Goro objects when the doctor tells him he can't practice for the game.
When Goro underestimates the opposing pitcher Ichihara, Seishu's hopes of taking an early lead are pinned on their only remaining batter, Tashiro.
