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棒球大联盟
时隔吾郎转学四年，吾郎初中三年级，由于养父转会回到三船就读于三船东初中。因少棒时期曾经弄伤右肩，经养父指点吾郎改为左投加入三船东中棒球部，与幼年的好朋友小森等人一起打棒球。为了成为职业棒球选手，吾郎的最佳选择就是在县大赛中能成为棒球名校海堂高中的特招生，而此时幼时的伙伴佐藤寿也所在的友之浦中学棒球部也立志要夺冠。原来寿也的父母在寿也小学五年级时因负债累累抛弃了他，寿也由爷爷奶奶抚养长大，寿也感怀于爷爷奶奶的养育之恩唯一的最快的赚钱方式就是成为职棒选手。而此时，海堂高中球探同时看中了吾郎与寿也，但由于误解了吾郎的话，致使寿也失去了进入海堂的机会。吾郎和寿也决定在县大赛中一决雌雄，败者自动放弃海堂高中。结果寿也所在的友之浦败给了吾郎所在的三船东中，吾郎也因海堂球探对寿也的恶意行为而拒绝了海堂。然而海堂的球探为了让吾郎认识到海堂的实力，在大赛中动用超强的海堂特招生眉村，打败了吾郎。吾郎认识到了自己与海堂的差距，于是和寿也一起考试进入海堂，通过艰苦的特训二人成为了海堂二军。然而吾郎的激情灵动的棒球完全违背海堂程式化棒球的原则，吾郎面临被退部的可能。吾郎找到海堂棒球的监督助理江头，江头因吾郎的出生背景而意将吾郎当成摇钱树，海堂二军监督早乙女静香则因吾郎与她去世的哥哥完全相似而意欲保护吾郎。吾郎会何去何从？是退部，还是另有其他打算，向来身为挑战者的吾郎会有怎样的表现……
Goro moves back to Mifune. Komori is glad to have the chance to play baseball with him again, only for Goro to reveal he now plays soccer.
The delinquents have left the baseball team, but none of the former members return. Goro's words inspire Komori and Obayashi to recruit new members.
Goro's story inspires the delinquents to get serious about baseball again. Goro goes to see the reborn Mifune East Junior High baseball team play.
Goro joins the baseball team. To gear up for the summer tournament, he seeks a game against Tomonoura Junior High, where he meets his old pal Toshiya.
Mifune East falls behind in round one of the tournament because Goro shows up late, but his off-speed pitches gets hitters out in fine fashion.
Mifune East faces Seibukan in round two. Goro has a perfect game going through 4 2/3 innings, enthralling a high school scout in the crowd.
Toshiya, Tomonoura's captain, proposes a bet to Goro that raises the stakes for their teams' showdown, but Goro gets goaded into a rash of mistakes.
Goro and Yamane hit back-to-back home runs, rattling Toshiya. Seeing his teammates band together, Toshiya realizes he'd forgotten the joy of baseball.
Toshiya takes the mound and freezes Miyamoto with his fastball. After encouragement from Goro, Miyamoto swings the bat, with unexpected results.
Goro is set on getting into Kaido High's baseball club with Toshiya after their junior high affiliate crushes him. The Mifune East boys hit the beach.
Goro, Toshiya and Komori all pass the first two stages of Kaido High's harsh skills test, but Toshiya and Komori are then pitted against each other.
The skills test ends with a five-on-five tournament. Goro is happy to be on Toshiya's team, but is looked down upon for coming from an obscure school.
Goro and Toshiya pass the skills test and must now take an academic exam. But Goro isn't used to studying, and he ends up being late to the exam.
Goro and Toshiya get into Kaido High and proudly join the baseball club. They go to a school facility on a small island for six months hard training.
After three months at the training facility, Goro has grown strong. The coaches announce an aptitude test to determine the players' positions.
In a final exam to decide who will leave the island to join the second team, Goro is as free-spirited as ever. Onuki, who had quit the team, shows up.
Coach Suo declares Goro will pass the test only if he can retire the opposing lineup in order, but Goro has come further than anyone imagined.
The first-year scholarship team intentionally spots the Dream Island team a three-run lead. The insult fills Goro's team with renewed determination.
Goro takes the mound, the team's expectations on his back, and gets back-to-back K's. As the Dream Island team is battling back, Mayumura shows up.
Toshiya hangs in against Akutsu by fouling off his knuckle balls. Shizuka kicks Akutsu off the team for focusing only on his competitive pride.
