Also known as: 長谷川圭一
A Japanese screenwriter, best known for his work on anime and Tokusatsu, especially the Heisei Ultraman series, and the Heisei Phase 2 and Reiwa era Kamen Rider series.
Shows written
Ultra Series
- Ultraman Tiga (Series)
- Ultraman Dyna (Series) (main writer)
- Ultraman Gaia (Series)
- Ultraman Cosmos (Series)
- Ultraman Nexus (Series) (series composer)
- Ultraman Mebius (Series)
- ULTRASEVEN X
- Ultra Galaxy Mega Dai-Kaijuu Battle
- Ultraman Ginga (Series) (series composer)
Kamen Rider
- Kamen Rider W
- Kamen Rider Fourze (Series)
- Kamen Rider Drive (Series)
- Kamen Rider Ghost (Series)
- Kamen Rider Saber (Series)
- Kamen Rider Gotchard (Series) (main writer, alongside Uchida Hiroki)
Super Sentai
Other live action shows
- Cutie Honey: The Live
- Majisuka Gakuen 3 (main writer)
Anime
- Devilman Lady
- The Big O
- Zoids: Chaotic Century
- Zoids: Shinseiki/Zero
- Mega Man Battle Network (Anime)
- Astro Boy: Tetsuwan Atom
- Hi No Tori
- Gaiking: Legend Of Daikuu Maryuu
- Happy Lucky Bikkuriman
- GeGeGe no Kitarou 5 (main writer, alongside Sanjou Riku)
- Hakaba Kitarou
- Viper'S Creed
- Shingeki No Bahamut: Genesis (series composer)
- SSSS.Gridman (main writer)
- GeGeGe no Kitarou 6
- SSSS.Dynazenon (main writer)
Movies
- Ultraman Tiga & Ultraman Dyna: Hikari No Hoshi No Senshi-Tachi
- Ultraman Tiga Ultraman Dyna & Ultraman Gaia: Cho Jiku No Dai Kessen
- Ultraman Tiga: The Final Odyssey
- Godzilla, Mothra and King Ghidorah: Giant Monsters All-Out Attack (co-written alongside Yokotani Masahiro and Kaneko Shusuke)
- Ultraman Cosmos 2: The Blue Planet (co-written alongside Kawakami Hideyuki)
- Ultraman Cosmos vs. Ultraman Justice: The Final Battle (co-written alongside Kawakami Hideyuki)
- Ultraman The Next (Movie)
- Ultraman Mebius & Ultra Brothers
- Great Decisive Battle! Superior 8 Ultra Brothers
- Ultraman Saga (Movie)
- Gridman Universe (Movie)
- Kamen Rider Gotchard: The Future Daybreak