Known For
Koki Mitani Filmography
| 2025 | Pray Speak What Has Happened (TV Series) · as Screenplay |
| 2024 | |
| 2022 | The 13 Lords of the Shogun (TV Series) · as Screenplay |
| 2021 | Promise of death · as Screenplay |
| 2020 | Peep Time (TV Series) |
| 2019 | Hit Me Anyone One More Time! · as Screenplay |
| 2018 | Kuroido Goroshi (TV Series) |
| 2016 | Sanada Maru (TV Series) · as Screenplay |
| 2015 | |
| 2015 | Murder on the Orient Express · as Screenplay |
| 2014 | Oyaji no Senaka (TV Series) |
| 2013 | |
| 2013 | |
| 2011 | A Flawless Concierge · as Screenplay |
| 2011 | |
| 2009 | The Three Musketeers (TV Series) · as Screenplay |
| 2008 | The Magic Hour · as Screenplay |
| 2006 | |
| 2004 | |
| 2004 | Shinsengumi! (TV Series) · as Screenplay |
| 2002 | Ryoma's Wife, Her Husband and Her Lover · as Screenplay |
| 2001 | |
| 1997 | Welcome Back, Mr. McDonald · as Screenplay |
| 1997 | Farewell, Mr. Premier (TV Series) · as Screenplay |
| 1996 | San-ban Tēburu no Kyaku (TV Series) |
| 1995 | Osama no Restaurant (TV Series) · as Screenplay |
| 1994 | Lieutenant Ninzaburo Furuhata (TV Series) |
| 1993 | He Is Always There (TV Series) |
| 1990 | Tales of the Unusual (TV Series) |
| 2024 | |
| 2020 | Peep Time (TV Series) |
| 2019 | |
| 2016 | Sanada Maru (TV Series) |
| 2015 | |
| 2013 | |
| 2013 | |
| 2011 | |
| 2011 | |
| 2011 | |
| 2008 | |
| 2006 | |
| 2001 | |
| 1997 | |
| 1994 | Lieutenant Ninzaburo Furuhata (TV Series) |
| 2024 | Kyu Ju Sai. Nani ga Medetai · as Taxi Driver |
| 2023 | The Makanai: Cooking for the Maiko House (TV Series) · as Mitani |
| 2021 | I Don't Have Any Money Left in My Retirement Account · as Moriguchi |
| 2020 | Peep Time (TV Series) · as Cast |
| 2019 | Idaten (TV Series) · as Kon Ichikawa |
| 2013 | Onna Nobunaga (TV Series) · as Yoshimoto Imagawa |
| 2011 | A Flawless Concierge · as The Film Director |
| 2009 | The Three Musketeers (TV Series) · as O'reilly (voice) |
| 2007 | Monkey Magic · as King |
| 2006 | Murder of the Inugami Clan · as Nasu Hoteru Shujin |
| 2006 | Love and Glory (TV Series) · as Yoshiaki Ashikaga |
| 2002 | |
| 1999 | Round About Midnight · as Man Watching Tv |
| 2013 | 2013 FNS Kayôsai · as Self |
| 2008 | VS Arashi (TV Series) · as Self |
| 1996 | SMAP×SMAP (TV Series) · as Self - Roulette Bowling Guest |
| 1994 | Lieutenant Ninzaburo Furuhata (TV Series) · as Self - Host |
| 2015 | Murder on the Orient Express (TV Series) · as Teleplay |
| 2011 | Short Cut · as Teleplay |
| 2010 | Wagaya no Rekishi (TV Series) · as Screenstory |
| 1996 | Shintaro Imaizumi (TV Series) · as Created By |
| 1991 | The Gentle Twelve · as Theatre Play |