Masters & Branch Chiefs
ISKF All Japan Seishinkai Karate Federation — Honorary Hanshi
Kayoko Mimura
Life: 1974-2015
Region: Hokkaido
2nd Director of the Seishinkan Headquarters
Yoichi Muroki
Life: 1927-2003
Region: Hokkaido
Seishinkai technical advisor
Professor Emeritus, Hokkaido University
ISKF All Japan Seishinkai Karate Federation — Masters, Branch Chiefs & Instructors
Full-time / Masters & Division Heads
Self-employed instructors take part in Seishinkai activities as volunteer instructors after their work day, and retired instructors do so after retirement (in no particular order)
Head of the Headquarters Dojo / Second-Generation Sōke
Tsubasa Okubo Chief Shihan
Occupation: Self-employed / Fujido Sports
Head of the Iaido Division / Public Relations Director
Takushi Muroki Shihan
Occupation: Retired / Advertising Company
Head of the Kobujutsu Division / International Affairs Director
Nobutaka Maekawa Shihan
Occupation: Retired (Mainichi Newspapers)
Chairman of the Branch Chiefs Council
Tadayuki Ishimori Shihan
Occupation: Retired (Iwamizawa City Hall)
Headquarters Instructors
※ Masters and branch chiefs take turns volunteering as instructors, taking part in headquarters and branch activities outside their regular work (in no particular order)
Takashima Assistant Shihan
Occupation: Organization staff
Saori Okimura Assistant Shihan
Occupation: Organization staff
Shima Deputy Shihan
Occupation: Organization staff
Takao Kimura Assistant Shihan
Occupation: Retired (judicial scrivener)
Asami Yamazaki Deputy Shihan
Occupation: Homemaker
Uchideshi (Live-in Students) & Trainees
※ Masters and branch chiefs take part in Seishinkai activities as volunteers outside their regular work (in no particular order)
Rui
Branch Chiefs (Shihan / Assistant Shihan / Deputy Shihan)
※ Masters and branch chiefs take part in Seishinkai activities as volunteer instructors outside their regular work (in no particular order)
Go Takahashi Shihan
Region: Takahashi Dojo
Occupation: Company employee
Katsunori Takahashi Deputy Shihan
Occupation: Company executive
Makiko Suda Shihan
Region: Sumiyoshi-juku
Occupation: Company employee
Yoshiaki Shirokawa Assistant Shihan
Region: Sumiyoshi-juku
Occupation: Retired (Hokkaido Electric)
Tetsuro Harada Assistant Shihan
Occupation: Company employee
Hashini Shihan
Region: Akan
Occupation: Company employee
Branch Chiefs, Instructors & Others
※ Instructors take part in Seishinkai activities as volunteers outside their regular work (in no particular order)
Yoshihiko Oikawa
Occupation: Oikawa Photo Office
Go Sato
Occupation: Organization staff
Toya Sugimoto
Occupation: Company employee
Haruto Sakai
Occupation: Company employee
Ami Saito
Occupation: Childcare worker
Nobunao Kurahashi
Region: Aichi
Occupation: Company employee
Masuda
Occupation: Engineer
Sahan
Region: Akan
Occupation: Company employee
Yuka Takigami
Region: Naganuma
Occupation: Medical field
Koichi Sueyoshi
Occupation: Company employee
Satoshi Maejima
Region: Shizuoka
Occupation: Organization staff
Masaya Matsuoka
Occupation: Company executive
Rio Oba
Occupation: Company employee
Kazuya Aoki
Occupation: Self-employed
Masaki Saegusa
Occupation: Company executive
Atsushi Saegusa
Occupation: Company executive
Akio Tashiro
Occupation: Company employee
Noriaki Ito
Occupation: Civil servant
Domestic Dan-Ranked Members (as of December 10, 2025)
| 1st Dan | 2nd Dan | 3rd Dan | 4th Dan | 5th Dan | 6th Dan | 7th Dan | 8th Dan |
|---|---|---|---|---|---|---|---|
| 180 | 31 | 18 | 8 | 3 | 4 | 6 | 3 |
Associate & Partner Dojos
| Chiba / Muryu-juku | Hokkaido / Aozorakai |
| Chiba / Muryu-juku | |
| Hokkaido / Aozorakai |
Overseas Masters & Branch Chiefs
Sasarashin Shihan
Region: Sri Lanka
Ken Shihan
Region: Sweden
Darren Shihan
Region: Australia
Greg Shihan
Region: Cayman Islands / Canada
Gondola Shihan
Region: Argentina
Aju Shihan
Region: India
Anthony Branch Chief
Region: New Zealand
Japi Branch Chief
Region: Philippines