Credits (text only)
Show 
Writer (52 credits)
Writer (52 credits)
Kamen Rider Gotchard
(TV Series) (8 episodes, 2023 - 2024) (screenplay - 11 episodes, 2023)
- A Rival Arrives!? Gotcha and Juliet
(2024)
- Gotcha! Crosshopper!
(2024)
- Habam Malice, Jet Black Wind
(2024)
- Smiling Angel, Ridiculous Joke
(2024)
- Chomping Rex! Dangerous X
(2023)
- Take It Back! Friendship × Forever!
(2023)
... (screenplay)
- Runaway Liner! Dark Rider!
(2023)
... (screenplay)
- Catch! A Spy!? Rider Disqualified!?
(2023)
... (screenplay)
- Kyoto on Fire! ~ Sad Love: Chemy Thunder Incident ~
(2023)
... (screenplay)
- Dash to Kyoto! School Trip!
(2023)
... (screenplay)
- Super A-Ranked Twisted Star
(2023)
... (screenplay)
- Burn! Fight! Wrestler G!
(2023)
... (screenplay)
- Antrooper Labyrinth
(2023)
... (screenplay)
- Bushido, Found.
(2023)
... (screenplay)
- Pursuit, Alchemy, Skebows!
(2023)
... (screenplay)
- Gotcha! Hopper1!
(2023)
... (screenplay)
2020-2021
Kamen Rider Saber
(TV Series) (written by - 19 episodes)
- The End of the World, the Story that is Born.
(2021)
... (written by)
- Goodbye, My Hero.
(2021)
... (written by)
- Ten Swordsmen, Betting the World.
(2021)
... (written by)
- Open, the Last Page.
(2021)
... (written by)
- For 2,000 Years, a Wish Spelled Out.
(2021)
... (written by)
- Shining Friendship, the Three Swordsmen.
(2021)
... (written by)
- And I, Will Become a God.
(2021)
... (written by)
- Wake Up, Immortal Swordsman.
(2021)
... (written by)
- At That Moment, the Swordsman Made His Move.
(2021)
... (written by)
- Writing the Past, Drawing the Future.
(2021)
... (written by)
- Sorrow, Turn It Into a Smile.
(2021)
... (written by)
- Nevertheless, I Want to Save People.
(2021)
... (written by)
- Shine the Best, Full Color.
(2021)
... (written by)
- Saving the World, a Ray of Light.
(2020)
... (written by)
- Beyond the Resolution, and Beyond.
(2020)
... (written by)
- The Promise, in that Place.
(2020)
... (written by)
- Disturbed Thunder, Spreading Dark Clouds.
(2020)
... (written by)
- The One That Is Sealed Is, Arthur.
(2020)
... (written by)
- The Sword of the King, Lies in Avalon.
(2020)
... (written by)
2021
SSSS.Dynazenon
(TV Series) (screenplay - 12 episodes)
- What is this Entrusted Thing?
(2021)
... (screenplay)
- What is This Unfulfilled Wish?
(2021)
... (screenplay)
- What Is This Remembered Memory?
(2021)
... (screenplay)
- What Is This Overlapping Emotion?
(2021)
... (screenplay)
- What Is This Wavering Emotion?
(2021)
... (screenplay)
- What's Our Reason for Coming Together?
(2021)
... (screenplay)
- What Is This Pain?
(2021)
... (screenplay)
- What's Lover-Like Mean?
(2021)
... (screenplay)
- What is this Palpitation?
(2021)
... (screenplay)
- What is a Traitor?
(2021)
... (screenplay)
- What is the Reason for Fighting?
(2021)
... (screenplay)
- What is a Kaiju User?
(2021)
... (screenplay)
2018
SSSS.Gridman
(TV Series) (screenplay - 12 episodes)
- Awakening
(2018)
... (screenplay)
- Decisive Battle
(2018)
... (screenplay)
- Collapse
(2018)
... (screenplay)
- Dream
(2018)
... (screenplay)
- Confrontation
(2018)
... (screenplay)
- Scheme
(2018)
... (screenplay)
- Contact
(2018)
... (screenplay)
- Provocation
(2018)
... (screenplay)
- Suspicion
(2018)
... (screenplay)
- Defeat
(2018)
... (screenplay)
- Restoration
(2018)
... (screenplay)
- Awakening
(2018)
... (screenplay)
2016
Kamen Rider Ghost
(TV Series) (written by - 15 episodes)
- Kettô! Kengô kara no Kotoba!
(2016)
... (written by)
- Senritsu! Kie yuku Sekai!
(2016)
... (written by)
- Gyôten! Sennin no Shinjitsu!
(2016)
... (written by)
- Gekidô! Chôkann no Ketsudan!
(2016)
... (written by)
- Shûtoku! Sorezore no Michi!
(2016)
... (written by)
- Môretsu! Aidoru Sengen!
(2016)
... (written by)
- Kiseki! Mugen no Omoi!
(2016)
... (written by)
- Tsuioku! Himeta Kokoro!
(2016)
... (written by)
- Kimyô! Ganmaizâ no Chikara!
(2016)
... (written by)
- Kattô! Ketsudan no Jôken!
(2016)
... (written by)
- Ihen! Akai Sora!
(2016)
... (written by)
- Ryaku! Aderu no Wana!
(2016)
... (written by)
- Kyôi! Ganma no Sekai!
(2016)
... (written by)
- Gyakuten! Shinpi na Kagaku!
(2016)
... (written by)
- Kenran! Maboroshi no Joô!
(2016)
... (written by)
2015-2016
Adrenaline no yoru
(TV Mini Series) (teleplay - 5 episodes)
- Mishiranu Kazoku (Unfamiliar Family)
(2016)
... (teleplay)
- Heroine (Main Cast)
(2016)
... (teleplay)
- Mou hitori no menkainin
(2016)
... (teleplay)
- Dosokai (Class reunion)
(2016)
... (teleplay)
- Azukari mono (Things in custody)
(2015)
... (teleplay)
2014-2015
Kamen Rider Drive
(TV Series) (written by - 14 episodes)
- Megami no Shinjitsu wa dokuniaru no ka
(2015)
... (written by - as Kei'ichi Hasegawa)
- Ôgon no Doraibu wa dôyatte Umareta no ka
(2015)
... (written by - as Kei'ichi Hasegawa)
- Jûdan wa Doko ni Seigi o Michibiku no ka
(2015)
... (written by - as Kei'ichi Hasegawa)
- Rôjyô Jiken wa naze Okita no ka
(2015)
... (written by - as Kei'ichi Hasegawa)
- Shinka no Hate ni Matsu mono wa nani ka
(2015)
... (written by - as Kei'ichi Hasegawa)
- Taisetsu na Kiyoku wa doushite Kesareta no ka
(2015)
... (written by - as Kei'ichi Hasegawa)
- Naze Kazoku wa Merawareta no ka
(2015)
... (written by - as Kei'ichi Hasegawa)
- Shijima Gô ga Tatakau Riyû wa nani ka
(2015)
... (written by - as Kei'ichi Hasegawa)
- Nani ga Keji wo Sabaku no ka
(2015)
... (written by - as Kei'ichi Hasegawa)
- Naze Otta-Keibuho wa soitsu o Otta no ka
(2015)
... (written by - as Kei'ichi Hasegawa)
- Sono Omoi ga Todoku no wa Itsu ka
(2015)
... (written by - as Kei'ichi Hasegawa)
- Kanojo o Nerau Kuroi Kage wa Dare ka
(2015)
... (written by - as Kei'ichi Hasegawa)
- Sono Mune ni Yadoru Himitsu to wa Nani ka
(2014)
... (written by - as Kei'ichi Hasegawa)
- Ketteiteki Shunkan wa Ika ni Satsuei-sareta no ka
(2014)
... (written by - as Kei'ichi Hasegawa)
2014
Rage of Bahamut: Genesis
(TV Series) (screenplay - 13 episodes)
- Rage of Bahamut
(2014)
... (screenplay)
- All Roads Lead to Abos
(2014)
... (screenplay)
- Helheim, Land of Lies
(2014)
... (screenplay)
- Decision in the Wailing Woods
(2014)
... (screenplay)
- Anatae, Part 3: Beyond the Storm
(2014)
... (screenplay)
- Anatae, Part 2: The Storm Rages
(2014)
... (screenplay)
- Roundup
(2014)
... (screenplay)
- Anatae, Part 1: Legendary Saint
(2014)
... (screenplay)
- Rescue in Sword Valley
(2014)
... (screenplay)
- Reunion at Ysmenport
(2014)
... (screenplay)
- Fog of Nebelville
(2014)
... (screenplay)
- Escape from Livian
(2014)
... (screenplay)
- Encounters in Wytearp
(2014)
... (screenplay)
2014
Kamen Rider Drive: Secret Mission
(TV Mini Series) (written by - 3 episodes)
- Taipu Zero Dai-zero-wa Kauntodaun tû Gurôbaru Furîzu
(2014)
... (written by)
- Taipu Terebi-kun Hantâ to Monsutâ Chô Kaitô no Nazo Ôe
(2014)
... (written by)
- Taipu Terebi-kun Hantâ to Monsutâ Chô Kaitô no Nazo Ôe
(2014)
... (written by)
2013
Ultraman Ginga
(TV Series) (written by - 5 episodes)
- Kimi no Mirai
(2013)
... (written by - as Kei'ichi Hasegawa)
- Ubawareta Ginga Supâku
(2013)
... (written by - as Kei'ichi Hasegawa)
- Heisekai
(2013)
... (written by - as Kei'ichi Hasegawa)
- Natsu no Yoru no Yume
(2013)
... (written by - as Kei'ichi Hasegawa)
- Hoshi no furu machi
(2013)
... (written by - as Kei'ichi Hasegawa)
2012
Majisuka gakuen
(TV Series) (teleplay - 3 episodes)
- Episode #3.12
(2012)
... (teleplay - as Kei'ichi Hasegawa)
- Episode #3.5
(2012)
... (teleplay - as Kei'ichi Hasegawa)
- Episode #3.1
(2012)
... (teleplay - as Kei'ichi Hasegawa)
2012
Kamen Rider Fourze
(TV Series) (written by - 8 episodes)
- Ri Nen Jô Nen
(2012)
... (written by - as Kei'ichi Hasegawa)
- Gaku En Hat To
(2012)
... (written by - as Kei'ichi Hasegawa)
- Hon Ki Den Ka
(2012)
... (written by - as Kei'ichi Hasegawa)
- Kai Jin Hô Sô
(2012)
... (written by - as Kei'ichi Hasegawa)
- Sen Pai Mu Yô
(2012)
... (written by - as Kei'ichi Hasegawa)
- Kô Hai Mu Gon
(2012)
... (written by - as Kei'ichi Hasegawa)
- Ei Yû Gan Bô
(2012)
... (written by - as Kei'ichi Hasegawa)
- Haku Chô Dô Mei
(2012)
... (written by - as Kei'ichi Hasegawa)
2009-2010
Kamen Rider W
(TV Series) (20 episodes)
- O's Link/Shroud's Confession
(2010)
- O's Link/The Old Detective
(2010)
- The J Labyrinth/The Diamond Is Hurt
(2010)
- Visitor X/In the Name of the Museum
(2010)
- Visitor X/The Bridge of Promises
(2010)
- Beyond the R/Surpass Them All
(2010)
- The Nightmarish H/Who Is the Prince?
(2010)
- The P's Game/Akiko on the Run
(2010)
- The T Returns/The Man Who Cannot Die
(2010)
- Farewell N/The Friend with the Wind
(2010)
- Farewell N/Memory Kids
(2010)
- The Q on the Radio/Live Catastrophe
(2009)
- The Q on the Radio/Targeted Princess
(2009)
- The Revenge V/Grudge Beast
(2009)
- The Revenge V/Infected Car
(2009)
2008
Graveyard Kitaro
(TV Series) (2 episodes)
- Kiri no naka Jonî
(2008)
... (as Kei'ichi Hasegawa)
- Kyûketsuki
(2008)
... (as Kei'ichi Hasegawa)
2007
Gegege no Kitarô
(TV Series) (written by - 5 episodes)
- The Ghost Train Goes to the Other World
(2007)
... (written by)
- Burn! Medama-Oyaji
(2007)
... (written by)
- The Cursed Movie
(2007)
... (written by)
- The Mysterious Melody! Yasha
(2007)
... (written by)
- The Street Where Yokai Dwell
(2007)
... (written by)
2006
Gaiking: Legend of Daikû Maryû
(TV Series) (teleplay - 7 episodes)
- Musuko yo
(2006)
... (teleplay - as Kei'ichi Hasegawa)
- NEX no harawata!! Ôkami no machi
(2006)
... (teleplay - as Kei'ichi Hasegawa)
- Tsumitobachi to noroi no ko! Aizô no Tenkû Maryû!!
(2006)
... (teleplay - as Kei'ichi Hasegawa)
- Abakareta kuroi kako! Garisu kanashimi no kamen!!
(2006)
... (teleplay - as Kei'ichi Hasegawa)
- Uranai tekichû 100-pâsento!? Zubari iu Ruru!!
(2006)
... (teleplay - as Kei'ichi Hasegawa)
- Yuenchi batoru! Rôsa no kyûjitsu
(2006)
... (teleplay - as Kei'ichi Hasegawa)
- Ruru no kiki! Kaitei no kyôfu!!
(2006)
... (teleplay - as Kei'ichi Hasegawa)
Ultraman Nexus
(TV Series) (head writer - 15 episodes, 2004 - 2005) (writer - 15 episodes, 2004 - 2005)
- Nexus
(2005)
... (head writer - as Kei'ichi Hasegawa) / (writer - as Kei'ichi Hasegawa)
- Unknown Hand
(2005)
... (head writer - as Kei'ichi Hasegawa) / (writer - as Kei'ichi Hasegawa)
- Prophecy
(2005)
... (head writer - as Kei'ichi Hasegawa) / (writer - as Kei'ichi Hasegawa)
- Hero
(2005)
... (head writer - as Kei'ichi Hasegawa) / (writer - as Kei'ichi Hasegawa)
- Satisfaction
(2005)
... (head writer - as Kei'ichi Hasegawa) / (writer - as Kei'ichi Hasegawa)
- Apocalypse
(2005)
... (head writer - as Kei'ichi Hasegawa) / (writer - as Kei'ichi Hasegawa)
- Darkness
(2005)
... (head writer - as Kei'ichi Hasegawa) / (writer - as Kei'ichi Hasegawa)
- Lost Soul
(2004)
... (head writer - as Kei'ichi Hasegawa) / (writer - as Kei'ichi Hasegawa)
- Marionette
(2004)
... (head writer - as Kei'ichi Hasegawa) / (writer - as Kei'ichi Hasegawa)
- Memory Police
(2004)
... (head writer - as Kei'ichi Hasegawa) / (writer - as Kei'ichi Hasegawa)
- Faust
(2004)
... (head writer - as Kei'ichi Hasegawa) / (writer - as Kei'ichi Hasegawa)
- Meta Field
(2004)
... (head writer - as Kei'ichi Hasegawa) / (writer - as Kei'ichi Hasegawa)
- Ultraman
(2004)
... (head writer - as Kei'ichi Hasegawa) / (writer - as Kei'ichi Hasegawa)
- Space Beast
(2004)
... (head writer - as Kei'ichi Hasegawa) / (writer - as Kei'ichi Hasegawa)
- Night Raid
(2004)
... (head writer - as Kei'ichi Hasegawa) / (writer - as Kei'ichi Hasegawa)
2004
Phoenix
(TV Series) (script - 2 episodes)
- Fukkatsu-hen sono ni
(2004)
... (script)
- Fukkatsu-hen sonoichi
(2004)
... (script)
2003
Strange Steel Fairy Rouran
(TV Series) (4 episodes)
- Tatakai no seijo
(2003)
... (as Kei'ichi Hasegawa)
- Yami no kioku
(2003)
... (as Kei'ichi Hasegawa)
- Akumu hate ni
(2003)
... (as Kei'ichi Hasegawa)
- Ashiki yumemishi
(2003)
... (as Kei'ichi Hasegawa)
2001
Ultraman Cosmos
(TV Series) (screenplay - 2 episodes)
- The Flying Whale
(2001)
... (screenplay - as Kei'ichi Hasegawa)
- Fly! Musashi
(2001)
... (screenplay - as Kei'ichi Hasegawa)
1999-2000
The Big O
(TV Series) (4 episodes)
- Winter Night Phantom
(2000)
... (as Kei'ichi Hasegawa)
- Missing Cat
(2000)
... (as Kei'ichi Hasegawa)
- R.D.
(2000)
... (as Kei'ichi Hasegawa)
- Bring Back My Ghost
(1999)
... (as Kei'ichi Hasegawa)
1998-1999
Ultraman Gaia
(TV Series) (8 episodes)
- The Cry of the Earth
(1999)
- The Attack of the Forest
(1999)
- The Fourth Symphony of a Nightmare
(1999)
- Battling the Legend
(1999)
- The Determination of Agul
(1999)
- The Fossil of Ruin
(1999)
- Lilia's Maze
(1999)
- The Night of the Marionettes
(1998)
1998-1999
Devilman Lady
(TV Series) (writer - 5 episodes)
- Life
(1999)
... (writer - as Kei'ichi Hasegawa)
- Wish
(1999)
... (writer - as Kei'ichi Hasegawa)
- Hunger
(1999)
... (writer - as Kei'ichi Hasegawa)
- Home
(1999)
... (writer - as Kei'ichi Hasegawa)
- Box
(1998)
... (writer - as Kei'ichi Hasegawa)
1999
Ultraman Tiga & Ultraman Dyna & Ultraman Gaia: Battle in Hyperspace
(screenplay - as Kei'ichi Hasegawa)
Ultraman Dyna
(TV Series) (1 episode, 1997) (screenplay - 13 episodes, 1997 - 1998)
- Final Chapter III: Toward Tomorrow...
(1998)
... (screenplay)
- Final Chapter II: Solar System Annihilation
(1998)
... (screenplay)
- Final Chapter I: A New Shadow
(1998)
... (screenplay)
- The Snow of Venus
(1998)
... (screenplay)
- The Smile of Destruction - Part 2
(1998)
... (screenplay)
- The Smile of Destruction - Part 1
(1998)
... (screenplay)
- Star of Peace
(1998)
... (screenplay)
- The Clarkov Won't Surface! - Part 2
(1998)
... (screenplay)
- The Clarkov Won't Surface! - Part 1
(1998)
... (screenplay)
- The Girls Who Calls Up the Darkness
(1998)
... (screenplay)
- The Kind-Hearted Target
(1997)
... (screenplay)
- 2000 Attacks
(1997)
- Aratanaru Hikari (Kôhen)
(1997)
... (screenplay)
- Aratanaru Hikari (Zenpen)
(1997)
... (screenplay)
1997
Ultraman: Tiga
(TV Series) (screenplay - 9 episodes)
- Kagayakeru mono tachi e
(1997)
... (screenplay)
- Ankoku no shihaisha
(1997)
... (screenplay)
- Goodbye to Darkness
(1997)
... (screenplay)
- Town Where the Girl Disappeared
(1997)
... (screenplay)
- Dear Mr. Ultraman
(1997)
... (screenplay)
- The Time-Transcending Smile
(1997)
... (screenplay)
- Vampire City
(1997)
... (screenplay)
- Blue Night's Memory
(1997)
... (screenplay)
- A Fog's Coming
(1997)
... (screenplay)
Show
Actor (3 credits)
Actor (3 credits)
2022
Kamen Rider Revice
(TV Series)
Soccer Club Member
Soccer Club Member
- Illusionary Guidance, Dream Afterwards
(2022)
... Soccer Club Member
- Seiyu! Say Me! The Aftermath of Youth
(2022)
... Soccer Club Member
2021
Kamen Rider Saber
(TV Series)
Humagear
Humagear
- The End of the World, the Story that is Born.
(2021)
... Humagear
Show
Self (1 credit)
Self (1 credit)
2014
SciFi Japan TV
(TV Series documentary)
Self
Self
- Ultraman Nexus: Memories
(2014)
... Self (as Kei'ichi Hasegawa)
- Ultraman Nexus: Production
(2014)
... Self (as Kei'ichi Hasegawa)
- Ultraman Nexus: Origins
(2014)
... Self (as Kei'ichi Hasegawa)