Sakai Ichirou comes from Saitama prefecture and is a third year student of Seidou High School. He is a left fielder of the Seidou baseball team.

With a stray pitch that completely missed the batter, Eijun Sawamura loses his final middle school baseball game. Frustrated by this defeat, Eijun and his teammates vow to reach the national tournament once they are in high school. But everything changes when a scout unexpectedly invites him to Tokyo's prestigious Seidou High School after seeing the potential in his unusual pitching style. Encouraged by his teammates, Eijun accepts the offer, ready to improve his skills and play at a much more competitive level of baseball. 
 
However, now surrounded by a large number of skilled players, Eijun struggles to find his place on the team. He declares that he will one day become the team's ace, but that's only if fellow first year Satoru Furuya doesn't take the title first, with his breakneck fastballs that earn him a coveted spot on the starting roster. With the addition of these talented new players to an already powerful lineup, the Seidou baseball team aims to become the best in Japan, facing off against a number of formidable foes that stand in their way. 
 
(Source: MAL Rewrite)

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Eijun Sawamura had his heart set on the middle-school national baseball championships. But his team is eliminated thanks to a wild pitch thrown by Eijun himself. He’s planning to go to high school with his teammates and try again next year when he’s scouted by the famous Seido High School baseball team. When he goes for a campus visit, he finds himself on the receiving end of a baptism by fire! His experience forming a battery with up-and-coming catcher Miyuki rekindles his passion for baseball!!
 
(Source: Kodansha USA)
 
Notes: 
- Chapter count includes 6 extra chapters.

The second season of Diamond no Ace. 

After the National Tournament, the Seidou High baseball team moves forward with uncertainty as the Fall season quickly approaches. In an attempt to build a stronger team centered around their new captain, fresh faces join the starting roster for the very first time. Previous losses weigh heavily on the minds of the veteran players as they continue their rigorous training, preparing for what will inevitably be their toughest season yet.

Rivals both new and old stand in their path as Seidou once again climbs their way toward the top, one game at a time. Needed now more than ever before, Furuya and Eijun must be determined to pitch with all their skill and strength in order to lead their team to victory. And this time, one of these young pitchers may finally claim that coveted title: "The Ace of Seidou." 

[Written by MAL Rewrite]

Picking up the next year after the end of the fall tournament, Seidou High School baseball team battle it out with new and old faces as they begin their tournament run at Koshien. 

(Source: Crunchyroll)

Ichirou Sakai