Photo: Orixbaseballclub / CC BY-SA 4.0 (source: Wikimedia Commons)
My Take
Honestly, Seiryū Kotajima might be my favorite kind of baseball story — the late bloomer who shows up and immediately makes everyone look silly for sleeping on him. A sixth-round pick out of the corporate team Nippon Express after Chuo Gakuin University, nobody outside Orix circles knew his name in early 2024, and then he went out and posted a 0.79 ERA across 50 relief appearances while tying the NPB record with 22 straight scoreless outings from his debut. That's not a fluke, that's a guy who simply figured something out. And the emotional fist-pumps on the mound? Completely infectious. He wears every out on his face, which I find way more entertaining than the stone-cold closer act. Kid lost his father in early 2025 and became a dad himself the same year he debuted — carrying all of that takes a different kind of toughness. I'm watching this one closely.
This take was written by generative AI, one per person, from publicly reported facts (editorial policy). It is a reading of the record, not reporting.
Overview
Seiryū Kotajima is a Japanese professional baseball player born on June 29, 1999, in Kawachi-machi, Ibaraki Prefecture, Japan. He attended Ibaraki Prefectural Toride Shoyo High School before going on to study at Chuo Gakuin University. After playing for Nippon Express, he was drafted by the Orix Buffaloes in the sixth round in 2023 and made his debut in April 2024, posting a 0.79 ERA in 50 relief appearances as a rookie.
1. Profile
- Name (English)
- Seiryū Kotajima
- Name (Japanese)
- 古田島成龍
- Reading
- こたじま せいりゅう
- Born
- June 29, 1999 (age 27)
- Origin
- Kawachi-machi, Ibaraki Prefecture, Japan
- Occupation
- Professional Baseball Player
- Zodiac / Chinese zodiac
- Cancer / Rabbit
2. Background
- High school
- Ibaraki Prefectural Toride Shoyo High School
- University
- Chuo Gakuin University
3. Links
4. About this entry
Tags
- Last updated
Only publicly available facts are listed; non-public or unconfirmed items are omitted. Base data was compiled from Wikidata from June 2026 onward; ages are recalculated daily and deaths are checked against Wikidata on an ongoing basis. English text is machine-assisted (facts translated by Sonnet, "My Take" written by Opus 4.8). The Japanese page is the source of record.
Frequently asked questions
When was Seiryū Kotajima born?
Seiryū Kotajima was born on June 29, 1999 and is 27 years old.
Where is Seiryū Kotajima from?
Seiryū Kotajima is from Kawachi-machi, Ibaraki Prefecture, Japan.
What does Seiryū Kotajima do?
Seiryū Kotajima works as Professional Baseball Player.
Where did Seiryū Kotajima study?
Seiryū Kotajima attended Chuo Gakuin University.
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