Diamond no Ace Wiki
Ōta Kazuyoshi
Seidou High School
Club President
Bats: - Throws: -
Kanji 太田 一義
Gender Male
Date of birth 14 September
Bloodtype A
Height 166 cm
Weight 85 kg
First Appearance
Manga Act I - Chapter 4
Anime S1 - Episode 3
Voice Actor Eiji Takeuchi
Tsuyuzaki Wataru (Act II)
He became the master of the bullpen before we knew it.
Oota about Ochiai Hiromitsu

Oota is the club president of the Seidou High baseball team. He is also a History teacher. [1]


Oota is a plump guy and it appears that he is a little bit smaller than Kataoka. He has short brown hair, sideburns and thick eyebrows. He often wears brown trousers and a green tie.


Oota can be found in the dugout when Seidou is have a match. During games when Seidou is in a pinch, Oota has a habit of constantly calling for Kawakami to replace the current pitcher.


Although he is not a coach or manager, Oota plays his part as the club president well by being very supportive of the Seidou baseball team. This is often highlighted by his favoritism toward Kawakami, one of first string’s pitchers. He generally has an amiable personality, but can be known to panic in certain situations. Such is true when Sawamura began playing on the first string. Not having begun to trust Sawamura yet, Oota would often panic when Sawamura would find himself in a pinch, and immediately turn to Coach Kataoka in hopes of substituting him with another pitcher. Aside from his instances of panic during games, Oota is generally trusting in the players at Seidou, as well as Coach Kataoka



Relationships with other characters[]

Kataoka Tesshin[]

Oota values Kataoka’s opinion and deeply respects him.

Sawamura Eijun[]

At the beginning of the series Oota didn't see nor believed in Sawamura's hidden talents. It seemed that he thought that Sawamura is bound for failure, but he eventually acknowledges and starts to trust him (even if only a little).

Kawakami Norifumi[]

It's revealed during the series that Kawakami is his favorite pitcher on the team.[2]


  • "It's like the bullpen is his backyard." - about Sawamura [3]
  • "Kawakami won't let that be the end of it!" - to Kataoka [4]


  1. Official Guide Book - Omote
  2. S2 - Episode 29
  3. Act I - Chapter 247
  4. Act I - Chapter 292