---
name: "Hiroshi Seko"
canonical: "https://film.one/person/hiroshi-seko"
roles: ["Writer"]
born: "1 January 1981"
reviewed_on_fi1m: 1
average_as: "writer"
average_over: 1
updated: "2026-09-17T22:10:11.117506+00:00"
licence: "© Fi1m Ltd. Written by AI under a human editor; checked against sources before publication. Quote with attribution and a link to the canonical URL."
---

# Hiroshi Seko

Writer. Born 1 January 1981 in Nagoya, Aichi, Japan.

## Details

- **Work:** Writer
- **Born:** 1 January 1981, Nagoya, Aichi, Japan
- **Also known as:** Kouji Seko, Koji Seko, Kōji Seko, 瀬古 浩司
- **Elsewhere:** https://en.wikipedia.org/wiki/Hiroshi_Seko, https://www.wikidata.org/wiki/Q56346814, https://www.imdb.com/name/nm5003154/, https://www.themoviedb.org/person/1491863

## Streaming the US now

- **Crunchyroll:** [*Attack on Titan*](https://film.one/tv/attack-on-titan.md) (83)

For United States; add `?region=XX` for another country.

## Biography

Hiroshi Seko (瀬古 浩司) is a Japanese anime screenwriter, also credited as Kouji Seko, Koji Seko or Kōji Seko. He was born in 1981 in Nagoya, Aichi Prefecture. He began in production roles at Gainax before writing episode scripts, including for *Panty & Stocking with Garterbelt* (2010).

Seko has worked extensively as a series composer and writer on television anime, including *Attack on Titan* (2013–2023), *Mob Psycho 100* (2016–2022), *Vinland Saga* (2019–2023), *Jujutsu Kaisen* (2020–), *Chainsaw Man* (2022) and *Dan Da Dan* (2024). He has also written screenplays for films such as *Jujutsu Kaisen 0* (2021) and contributed to novels and manga adaptations tied to *Attack on Titan*.

*Sources: en.wikipedia.org, imdb.com, ja.wikipedia.org.*

## On Fi1m (1)

- *Attack on Titan* (2013), Fi1m 83, Series Composition, Writer — [page](https://film.one/tv/attack-on-titan.md)

## Complete filmography (49)

Every credit, newest first. Titles without a page can be requested for review on the HTML page.

- *Crunchyroll Anime Nights - Mob Psycho 100* (2026), Series Composition, Screenplay
- *Thunder 3* (2026), series, Series Composition, Screenplay
- *Witch Hat Atelier* (2026), series, Series Composition, Writer
- *Rooster Fighter* (2026), series, Script
- *JUJUTSU KAISEN: Execution* (2025), Series Composition, Screenplay
- *Chainsaw Man - The Movie: Reze Arc* (2025), Screenplay
- *Gachiakuta* (2025), series, Series Composition, Writer
- *JUJUTSU KAISEN: Hidden Inventory / Premature Death - The Movie* (2025), Series Composition, Writer
- *DAN DA DAN: Evil Eye* (2025), Series Composition, Writer
- *Dan Da Dan* (2024), series, Series Composition, Writer
- *DAN DA DAN: First Encounter* (2024), Series Composition, Writer
- *WIND BREAKER* (2024), series, Series Composition, Writer
- *Attack on Titan: THE LAST ATTACK* (2024), Screenplay
- *GAMERA -Rebirth-* (2023), series, Series Composition
- *Zom 100: Bucket List of the Dead* (2023), series, Series Composition, Writer
- *Chainsaw Man* (2022), series, Series Composition, Writer
- *SPRIGGAN* (2022), series, Series Composition, Writer
- *Summer Time Rendering* (2022), series, Series Composition, Writer
- *Jujutsu Kaisen 0* (2021), Screenplay
- *Star Wars: Visions* (2021), series, Writer
- *The Idaten Deities Know Only Peace* (2021), series, Series Composition, Writer
- *Twittering Birds Never Fly: Don't Stay Gold* (2021), Screenplay
- *JUJUTSU KAISEN* (2020), series, Series Composition, Writer
- *Deca-Dence* (2020), series, Writer, Series Composition
- *Twittering Birds Never Fly: The Clouds Gather* (2020), Screenplay
- *Dorohedoro* (2020), series, Series Composition, Writer
- *Levius* (2019), series, Series Composition
- *Vinland Saga* (2019), series, Writer, Series Composition
- *Banana Fish* (2018), series, Series Composition, Screenplay, Writer
- *The Legend of the Galactic Heroes: Die Neue These* (2018), series, Writer
- *DARLING in the FRANXX* (2018), series, Writer
- *Inuyashiki* (2017), series, Series Composition
- *Ajin: Demi-Human* (2017), Writer
- *Kakegurui* (2017), series, Writer
- *Ajin: Demi-Human – Collide* (2016), Series Composition
- *Mob Psycho 100* (2016), series, Series Composition, Writer
- *Mob Psycho 100* (2016), Writer
- *Ajin: Demi-Human – Confront* (2016), Series Composition
- *Kabaneri of the Iron Fortress* (2016), series, Writer
- *Ajin* (2016), series, Series Composition, Writer
- *Ajin: Demi-Human – Compel* (2015), Series Composition
- *The Empire of Corpses* (2015), Screenplay
- *Seraph of the End* (2015), series, Series Composition, Writer
- *Japan Animator Expo* (2014), series, Writer
- *Terror in Resonance* (2014), series, Writer
- *Kill la Kill* (2013), series, Writer
- *Attack on Titan* (2013), series, Writer, Series Composition — Fi1m 83, [page](https://film.one/tv/attack-on-titan.md)
- *Panty & Stocking with Garterbelt* (2010), series, Writer, Scenario Writer
- *Chainsaw Man - Assassins Arc*, Writer

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© Fi1m Ltd. Written by AI under a human editor; checked against sources before publication. Quote with attribution and a link to the canonical URL. Canonical: https://film.one/person/hiroshi-seko