Ace of the Diamond act II Second Season will return for its second cour in October 2026, continuing Seido High School’s pursuit of a place at the Summer Koshien tournament.
The October broadcast window was confirmed shortly after the conclusion of the first cour, which aired from April 5 through June 28, 2026.
A new teaser visual has also been released, placing Seido captain Kazuya Miyuki opposite Inashiro Industrial ace Mei Narumiya ahead of the West Tokyo tournament final.
The announcement additionally confirms that GLAY will perform the second cour’s opening theme, while OxT will provide the ending theme. The titles and release dates of both songs have not yet been revealed.
Ace of the Diamond act II Second Season Returns in October 2026
The second cour will begin airing in Japan sometime in October 2026 through TV Tokyo’s six-station network, AT-X and other participating broadcasters.
A specific premiere date and broadcast time have not yet been announced.
- Second-cour premiere: October 2026
- Japanese broadcasters: TV Tokyo network, AT-X and additional stations
- Opening theme performer: GLAY
- Ending theme performer: OxT
- Director: Hideaki Oba
- Series composition: Kenji Konuta
- Character design: Yasukazu Shoji
- Animation production: OLM
The number of episodes planned for the second cour has not been formally announced.
Netflix will continue receiving episodes in Japan immediately after their television broadcasts, with other Japanese streaming platforms adding them later. International availability should be confirmed separately for each region.
The New Visual Sets Up Seido vs. Inashiro Industrial
The new teaser visual centers on Kazuya Miyuki and Mei Narumiya, two of the most important players entering the West Tokyo final.
Miyuki appears wearing Seido’s catcher equipment, while Narumiya stands opposite him in Inashiro Industrial’s uniform. Their confrontation represents far more than a simple matchup between a batter and pitcher.
Both players have become leaders of teams carrying championship expectations. Miyuki directs Seido’s pitchers and defense from behind the plate, while Narumiya serves as the dominant ace around whom Inashiro’s entire strategy is constructed.
Their history also makes the matchup deeply personal. Narumiya previously invited Miyuki to join him at Inashiro, believing they could form the strongest battery in the country. Miyuki instead chose Seido, setting the two stars on opposing paths.
The West Tokyo Final Will Decide Seido’s Koshien Future
The second cour will focus on the final of the West Tokyo qualifying tournament, where Seido and Inashiro Industrial compete for a place at the Summer Koshien tournament.
Only the winner can advance to the national stage.
Seido enters the game after defeating Ichidai Sankou in a difficult semifinal. That victory demonstrated the team’s growth but also exposed the physical and emotional pressure carried by its pitching staff.
Inashiro represents an even greater obstacle. The school possesses experience, confidence and one of the best pitchers in high school baseball.
For Seido’s senior players, the final may be their last opportunity to reach Summer Koshien. Miyuki, Kuramochi, Shirasu, Maezono and the other third-year students have spent their final season preparing for this moment.
The Match Is a Rematch Years in the Making
Seido and Inashiro previously faced one another in the final of the West Tokyo tournament during Eijun Sawamura’s first year.
That game ended with Inashiro earning the Koshien berth and Seido suffering one of the most painful defeats in the series.
The loss affected every member of the team, particularly Sawamura, whose final pitch struck an opposing batter and contributed to the decisive sequence.
Its consequences continued long after the tournament. Sawamura developed difficulty throwing inside pitches, while Seido’s former third-year players graduated without reaching their ultimate objective.
The new final gives Sawamura and the remaining players an opportunity to confront that memory directly.
Eijun Sawamura Enters the Final as Seido’s Ace
Eijun Sawamura began the story as an inexperienced pitcher from Nagano with an unusual moving fastball and almost no understanding of elite baseball.
His determination, unpredictable pitching and ability to energize teammates earned him a place on Seido’s roster, but becoming the team’s ace required years of technical and emotional development.
Sawamura now carries the number one on his back. That uniform number represents the trust of the coaches and players, but it also places him under constant pressure to perform like the leader of the pitching staff.
The first cour showed how seriously he takes that responsibility. Even when his performance does not match his expectations, Sawamura continues studying opponents and searching for ways to support the team.
Facing Inashiro allows him to measure the distance between the frightened first-year pitcher who left the mound in defeat and the ace he has become.
Mei Narumiya Remains the Pitcher Seido Must Overcome
Mei Narumiya is widely regarded as one of the strongest pitchers in Japanese high school baseball.
His arsenal combines velocity, control and several effective breaking pitches. He can challenge hitters aggressively while adjusting his approach according to the situation.
Narumiya also possesses the confidence expected from a pitcher who believes he should dominate every opponent.
That confidence can appear arrogant, but it is supported by experience and an intense commitment to winning. Inashiro’s players trust him to control the most important moments of the game.
Seido cannot expect to defeat him through one fortunate hit. Its lineup will need to create pressure, extend at-bats and take advantage of every opportunity.
Kazuya Miyuki Faces One of His Greatest Challenges
Kazuya Miyuki enters the final as Seido’s captain, starting catcher and one of its most dangerous batters.
His responsibilities extend across every part of the game. He must guide the pitching staff, control the defense, contribute offensively and prevent the pressure of the final from affecting the younger players.
Miyuki’s rivalry with Narumiya gives the matchup additional emotional weight.
Narumiya wanted Miyuki as his catcher because he recognized his intelligence and ability to bring out a pitcher’s strengths. Their decision to attend different schools eventually created one of the defining rivalries of their generation.
The new teaser visual reflects the importance of that history as both players approach the final tournament game of their high school careers.
GLAY Performs the New Opening Theme
Japanese rock band GLAY will perform the second cour’s opening theme.
The song’s title has not yet been announced.
GLAY has a long history with the Ace of the Diamond anime franchise. The band previously performed songs including “Heroes,” “Sora ga Aozora de Aru Tame ni” and “Hajimari no Uta.”
Its return for the West Tokyo final gives the second cour another connection to the earlier seasons and to the long journey that brought Seido back to Inashiro.
The new song is expected to accompany the series beginning with the first episode of the October cour, but its release date and whether it will appear in a future trailer remain unknown.
OxT Returns for the Ending Theme
OxT will perform the second cour’s ending theme.
The musical unit consists of vocalist Masayoshi Oishi and composer-guitarist Tom-H@ck.
OxT has maintained one of the strongest musical associations with Ace of the Diamond, contributing several songs across the franchise’s television adaptations.
The duo’s previous songs for the series include “Go EXCEED!!,” “Perfect HERO,” “BLOOM OF YOUTH,” “Golden After School” and other tracks closely associated with Seido’s development.
The title and release date of the new ending theme remain unannounced.
The First Cour Concluded After 13 Episodes
The first cour of Ace of the Diamond act II Second Season premiered on April 5, 2026, and concluded on June 28 with Episode 13.
Its story focused primarily on the closing stages of Seido’s summer tournament campaign, including the tense semifinal against Ichidai Sankou.
The anime then entered a planned break before the October return.
This means the second cour is not a separately numbered season. It is the continuation of the same Second Season production that began in April.
First-Cour Theme Songs
The first cour used “MIRACLE” by Baby Canta as its opening theme.
OxT performed the first ending theme, “Everlasting Dream.”
The October cour will replace both songs, with GLAY taking over the opening and OxT remaining with the series through a new ending theme.
The Main Seido Cast Returns
- Ryota Osaka as Eijun Sawamura
- Nobunaga Shimazaki as Satoru Furuya
- Takahiro Sakurai as Kazuya Miyuki
- Shintaro Asanuma as Yoichi Kuramochi
- Natsuki Hanae as Haruichi Kominato
- Hiro Shimono as Norifumi Kawakami
- Hiroaki Tajiri as Kenjiro Maezono
- Yoshiyuki Shimozuma as Kenjiro Shirasu
- Yoshitsugu Matsuoka as Shinji Kanemaru
- Shota Aoi as Hideaki Tojo
- Yuma Uchida as Koshu Okumura
- Shunsuke Takeuchi as Masashi Yuki
- Daiki Yamashita as Takuma Seto
- Ayumu Murase as Kaoru Yui
- Hiroki Touchi as Tesshin Kataoka
Inashiro’s Main Players
- Yuki Kaji as Mei Narumiya
- KENN as Carlos Toshiki Kamiya
- Soichiro Hoshi as Katsuyuki Shirakawa
- Kentaro Kumagai as Riku Yamaoka
- Yoshimasa Hosoya as Itsuki Tada
- Tsubasa Yonaga as Shinji Akamatsu
- Hiroshi Naka as Hiroshige Kunitomo
The established voice cast is expected to remain central throughout the final, with Sawamura, Miyuki and Narumiya receiving particular attention.
Hideaki Oba Directs the Second Season
Hideaki Oba directs Ace of the Diamond act II Second Season at OLM.
Baseball anime depends on more than reproducing pitches and swings accurately. The direction must communicate strategy, momentum and the emotional changes that occur during every at-bat.
The West Tokyo final is especially demanding because it contains several individual rivalries while functioning as one continuous team contest.
Small decisions involving pitch selection, defensive positioning and baserunning can completely alter the direction of the game.
Kenji Konuta Handles Series Composition
Kenji Konuta is responsible for series composition.
Konuta has worked extensively on the Ace of the Diamond anime franchise and understands the large cast, baseball terminology and long-term character development established across earlier seasons.
The second cour must preserve the deliberate pacing of the final while ensuring that the strategy remains understandable to viewers who may not know every technical detail of baseball.
OLM Produces the Animation
OLM handles animation production for the new season.
The studio is responsible for presenting the pitching mechanics, batting forms and fielding movements that distinguish each player.
The Inashiro final will require consistent animation across a long game in which individual pitches and reactions carry major narrative importance.
Main Production Staff
- Original manga: Yuji Terajima
- Director: Hideaki Oba
- Series composition: Kenji Konuta
- Character design: Yasukazu Shoji
- Music: Hajime Hyakkoku
- Animation production: OLM
- Second-cour opening: GLAY
- Second-cour ending: OxT
Based on Yuji Terajima’s Baseball Manga
Ace of the Diamond is based on the manga written and illustrated by Yuji Terajima.
The original series began serialization in Kodansha’s Weekly Shonen Magazine in 2006 and was collected in 47 volumes.
Its sequel, Ace of the Diamond act II, ran from 2015 through 2022 and was collected in 34 volumes.
The story follows Sawamura after he leaves his hometown to attend Seido, one of Tokyo’s most competitive baseball schools.
Rather than immediately becoming the team’s dominant pitcher, Sawamura must compete with talented teammates, improve his control and learn how to work with elite catcher Miyuki.
The Anime Returned After Six Years
The previous Ace of the Diamond act II television series aired from April 2019 through March 2020.
The April 2026 premiere therefore marked the anime’s return after approximately six years without a new television season.
The continuation brings the adaptation closer to the conclusion of the act II manga and to the tournament game readers had waited years to see animated.
What Remains Unknown About Cour 2?
The exact October 2026 premiere date has not yet been announced.
The second cour’s episode count and complete broadcast schedule remain unknown.
GLAY and OxT have been confirmed as the theme-song performers, but the song titles, release dates and audio previews have not been revealed.
International streaming details for the October episodes should be confirmed closer to the premiere.
Final Thoughts
Ace of the Diamond act II Second Season will return for its second cour in October 2026.
The newly released teaser visual places Seido captain Kazuya Miyuki opposite Inashiro ace Mei Narumiya before the West Tokyo tournament final.
GLAY will perform the new opening theme, while longtime franchise collaborator OxT will provide the ending song. Both titles remain unannounced.
The second cour continues directly from the 13-episode first half, which aired from April 5 through June 28.
Hideaki Oba directs the anime at OLM, with Kenji Konuta handling series composition, Yasukazu Shoji designing the characters and Hajime Hyakkoku composing the music.
With a Summer Koshien berth at stake and the painful memory of Seido’s previous loss still shaping both teams, the October cour will bring Sawamura, Miyuki and Narumiya into one of the most important games in the entire Ace of the Diamond story.
