Cast & creator
Mantaro Koichi
Best known for AIBOU: Tokyo Detective Duo, The Files of the Young Kindaichi, 99.9 Criminal Lawyer
Mantarō Koichi (小市 慢太郎 , Koichi Mantarō), born on February 15, 1969 in Osaka, is a Japanese actor. He occasionally does voice work for anime and TV dramas. He's affiliated with Gekidan M.O.P., an agency that mostly assigns work for live action movies and TV series. His bloodtype is B.
Also known as: 小市 慢太郎, Koichi Mantaro
58
film credits
50
television credits
108
1995–2026 · acting roles
6.9
average across scored titles
Signature credits
Known for
Across film & television
Filmography (108)
Showing 108 of 108 credits
AIBOU: Tokyo Detective Duo
2002
The Files of the Young Kindaichi
Ken Izumaru
1995
99.9 Criminal Lawyer
Inaba
2016
CSI: Crime Scene Talks
2011
Emergency Room 24 Hours
Manabu Hibiya（日比谷 学）
1999
Galileo
Hiroshi Kamimura
2007
Ryōmaden
2010
Hero
Yagi
2001
Cold Case: Door of Truth
Yasui
2016
Bungo Japanese Literature Cinema
Muramatsu
2010
Suits
Yukio Karashima
2018
Hanasaki Mai Speaks Out
Takahiko Isobe
2014
The Files of Young Kindaichi
Ken Izumaru
2022
Moribito: Guardian of the Spirit
The Cooles
2016
CRISIS: Special Security Squad
2017
Attention Please
Makoto Watanabe
2006
The Hours of My Life
Akio Sawada
2014
Kiss that Kills
Gunji Arai
2018
Fukushima 50
Chairman of Japanese Nuclear Safety Commission
2020
Gourmet Detective Goro Akechi
Yasuya Dateh
2020
Innocence, Fight Against False Charges
Rintaro Ibusuki
2019
Sherlock: Untold Stories
Takahisa Inui
2019
Voice
Kenichi Tadokoro
2019
The Sun Does Not Move
Miura
2020
Shinigami-kun
2014
MR.BRAIN
2009
Nozaki Shuhei - Auditor of Bank
Ryoma Kashiwagi
2018
Rurouni Kenshin Part II: Kyoto Inferno
Toshiyoshi Kawaji
2014
Rurouni Kenshin Part III: The Legend Ends
Toshiyoshi Kawaji
2014
Nobunaga Concerto
Yoshikage Asakura
2014
What Do You Really Do About Love?
Jiro Okashita
2022
Unmet: Diary of a Neurosurgeon
Takami Takeshi
2024
Wonderful Single Life
Shuji Tanigawa
2012
Akira and Akira
2017
Angels with Broken Wings
Sugawara
2006
Steel Frame
2010
Kurokouchi
Ushii Takeshi
2013
White and Yellow ~My Pancake Story from Hawaii~
Sawano Kyoji [Nami's uncle]
2018
Evil God's Balance Public Security Analysis Team
Shuzo Kunieda
2022
Lost ID
Baba
2016
Matrilineal Family
2005
Wave, Listen to Me!
Kureko Katsumi
2023
Two People Who Can't Fall in Love
2022
HUNT - Tax Investigation Officer
Shiro Kume
2010
Azamijô no lullaby
2010
Reincarnation
Yamanaka Producer
2005
Radiance
Sano
2017
The Inugami Family
Isokawa
2023
Nozaki Shuhei President of Bank
Ryoma Kashiwagi
2020
Destiny-Like Love
Fujii Yoji
2016
Samurai Spirits 2: Asura Zanmaden
Galford
1999
FACE - Cyber Hanzai Tokusouhan
2017
Tales of the Bizarre: 2017 Fall Special
2017
Perfect World
2018
The Summit: A Chronicle Of Stones to Serenity
Kinjiro Okano
2009
Umanohone: The Legendary Sword
2005
My Friend "A"
President Kawashima
2018
No-Pants Girls: Movie Box-ing2
2004
悪魔の手毬唄
2026
Walking My Life
Wakaizumi
2007
The Agent Family
Toshio Sato
2021
Platonic Sex
2001
Ekeb of Dekye
Kenzo Furuyama
2010
Ghost Theater
Gota Nishikino
2015
Miracle: Devil Claus' Love and Magic
Natsuki Kurita
2014
Yatsuhakamura
磯川警部
2019
A Long Goodbye
2019
Karaoke Terror
2003
A Samurai Chronicle
2014
The Hidden Blade
2004
We're Both Grooms
Seto Takeshi
2022
Perfect Blue
2010
Somebody's Xylophone
2016
The Vulture
2009
Colors of Wind
Kitta
2018
Sniper
Satoru Kanbe
2016
Antenna
Shigenobu
2004
Osaka Love & Soul
2010
Concent
Yamagishi
2002
The End of Summer
2013
Care Nin
Hirofumi Kudo
2017
Tokyo Refugees
Kobayakawa
2014
Till Death Do Us What?
Yamashita
2015
Mellow
Furukawa Sakon
2020
Gassoh
2015
One Left Hand Shot
2020
Care Nin 2: The Flower in Your Heart
Hirofumi Kudo
2020
Stake Out
Tasuku Yoshioka
2001
Locomotive Teacher
2004
Error
2017
Piece: Fragments of a Memory
Tojiro Tsuda
2012
Prison Gate Island
Inspector Isokawa
2016
Ai wa mieru: Zenmô fûfu ni yadotta chiisana inochi
2010
Samurai Shodown 2
Galford
1999
The Sunday Runoff
2022
Neck Bowed in the Rain
Jingoro Gyoda
2018
Only the Cat Knows
Masaki
2019
Ichigo Chips
Sakai
2005
Sixteen
Sawazaki
2007
For Love's Sake
2018
Before a Falling Star Fades Away
奈緒子の父
2015
Death on Gokumon Island
Inspector Isokawa
2016The Sparkling Amber
2013
Memory's Technique
Kazuno Tadashi
2020Pink Subaru
Zen
2011
The Tokyo Wind Orchestra
Kazuya Tachibana
2016
Blossoming Into a Family
Seishiro Ishikawa
2017
Scarecrow and Racket: Aki and Tamako’s Summer Vacation
Masaya Odagiri
2015