Self-Destruction
Inashiro ask a change in player, replacing Hirano as pitcher with Mei. With the new team in Inashiro, there is a lack of leader, coach is thinking of making Mei the captain of this team. Mei strikes out the first batter on his first pitch. Ugumori's player Gacchan manage a steal. Inashiro sends in a messenger. Inashiro teammates reconfirm confidence in Mei, but he doesn't seem to need it, he is already confident enough. Mei pitches, and resulting in two foul, The catcher called for change-up but Mei denies, The cather then called for a forkball and Mei saids no, they can't seems to agree on the pitch. Em decides they can force their way with a fastball and batter hits resulting 2 run for Ugumori. In Seido, Sawamura tells the assistant coach not able to pitch what he want to pitch and walk away is scarier than pitching an inside ball. While samara is looking forward to the payback he will have with Inashiro, They get a call informing them the defeat of Inashiro. Coach tells Mei that an Ace that pitches for himself is not an true Ace.
Aired 22/06/2015EP 12 - Self-Destruction

Ace of the Diamond Second Season
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]