DAIYA NO ACE (Japanese: ダイヤのA; English: Ace of Diamond) is a Japanese anime centering around baseball written and illustrated by Yuji Terajima.
The series follows one Eijun Sawamura, a baseball pitcher with a very unusual change of pitch that has occurred naturally. Sawamura plans to go with his friends to a local high school and play baseball to the best of their abilities. However, one scout from the prestigious Seidou High approaches him and offers him a scholarship and a chance to make it to the nationals. Sawamura decides to pay a visit to the school, and it changes his entire outlook on the future. The first season follows Seidou and their main rivals as they attempt to help the upperclassmen make it to nationals during the summer tournament. Once the summer tournament ends, the upperclassmen will be forced to retire, but how far can Sawamura help them go when he currently doesn’t have any control?
The second season continues to follow Sawamura, Furuya, Haruichi, and Miyuki as they lead a new team, along with a few returning faces, through the fall tournament. Their overly ambitious goal is to go to nationals during the fall tournament and convince Coach Kataoka that he doesn’t have to resign.
As of 2015, Terajima has released the sequel of the original series entitled “Ace of Diamond Act II,” featuring the former second years as third years and the former first years as second years. This also features the introduction of the new first years.