After a loss caused by his own wild pitch, pitcher Eijun Sawamura receives an invitation to join the elite Seido High School baseball team. There, he competes for the ace position while forming a battery with catcher Kazuya Miyuki.

Eijun initially plans to stay with his local teammates, but a scouting offer from a Tokyo powerhouse changes his trajectory. Thrust into a competitive environment, he encounters rival Satoru Furuya and a roster of ambitious athletes dedicated to reaching the national championships at Koshien.

The series explores the technical nuances and psychological pressure of high-stakes baseball. Eijun’s journey emphasizes growth through failure as he refines his moving fastballs to prove his worth on one of the nation's most prestigious mounds.

Follow Eijun Sawamura at Seido High School as he strives to become the starting pitcher in the complete Ace of the Diamond manga series.

Ace of the Diamond, Diamond no Ace, Eijun Sawamura, Kazuya Miyuki, Seido High School, Satoru Furuya, Sports, Baseball manga, Yuji Terajima, Koshien