Diamond no Ace: Second Season continues from Diamond no Ace, following Eijun Sawamura, Kazuya Miyuki, Haruichi Kominato, Satoru Furuya, and their efforts to conquer the sport of baseball. The summer heat finds the players preparing themselves for the oncoming fall season. Successes and failures from the previous season are still fresh, and summer offers the perfect chance to build new skills while honing old ones.

Because of their recent successes, the Seidou High School baseball team finds itself placed in the most difficult bracket around. The challenges that the players face against some of the best teams in the league will push everyone to their limits, including star player Sawamura.

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