After the finale episode of the TV anime, Ace Of The Diamond Act II Season 2 it was officially announced that this anime is receiving a second cour. The Cour 2 of Ace Of The Diamond Act II Season 2 (Japanese Name: Diamond No Ace Act II Second Season) is set to release in October 2026. The brand new key visual has been released for this second cour:

The key visual features Seido’s captain Miyuki Kazuya and Inashiro Industrial’s Ace Picther, Narumiya Mei, staring at each other for the final match of the West Tokyo Tournament of the National High School Baseball Championship between Seido High School vs. Inashiro Industrial in the series.
It is also revealed that the theme song artists from the previous seasons of this franchise, GLAY and OxT (Masayoshi Ōishi (vocals); Tom-H@ck (guitar, composer)) will be back for this finale cour. GLAY will perform the opening and OxT will perform the ending theme song for this anime.
Ace of Diamond Act II Season 2’s second cour will also be animated by Studio OLM Team Yoshioka. Bookmark Otaku Mantra for more updates!
All the voice acting cast and animation staff from the first cour will return. More information related to this anime will be revealed in the future!
About Ace Of Diamond
Ace of Diamond (Japanese Name: Diamond no Ace) is a Japanese manga series written by Terajima Yuji. This manga was serialised in 2006 in Kodansha’s Shonen manga magazine Weekly Shonen Magazine. This manga has a total of 47 Volumes. This manga has won the 53rd Shogakukan Manga Award for the shonen category in 2008. It also won the 34th Kodansha Manga Award for the shōnen category in 2010.
This manga later received a sequel titled Ace of Diamond Act II (Japanese Name: Diamond no Ace Act II), which was serialized in August 2015. This sequel manga has a total of 35 Volumes.
This manga later received an anime adaptation by Studio Madhouse and Production I.G, which was released in October 2013. This anime series also received a second season from the same studios, which was released in April 2015. This anime also received a sequel by Studio Madhouse, which adapted Act II of this manga with the same name. It was released in April 2019. Act II also received a second season in 2 split cours, in which cour 1 was released in April 2026, and cour 2 is announced for October 2026.
Kodansha USA has licensed this manga in English and describes its plot as:
“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: Official Website