Hiroshi Seko

Writing

Hiroshi Seko

Born

1981-01-01 (45)

Place of birth

Nagoya, Aichi, Japan

Known for

Writing

Credits

17 titles

Hiroshi Seko (瀬古 浩司, Seko Hiroshi) is a Japanese animation-oriented screenwriter.

Known for

Chainsaw Man - The Movie: Reze Arc poster
8.5

In a brutal war between devils, hunters, and secret enemies, a mysterious girl named Reze has stepped into Denji's world, and he faces his deadliest battle yet, fueled by love in a world where survival knows no rules.

Chainsaw Man - The Movie: Reze Arc

2025

JUJUTSU KAISEN: Execution poster
6.1

A veil abruptly descends over the busy Shibuya area amid the bustling Halloween crowds, trapping countless civilians inside. Satoru Gojo, the strongest jujutsu sorcerer, steps into the chaos. But lying in wait are curse users and spirits scheming to seal him away. Yuji Itadori, accompanied by his classmates and other top-tier jujutsu sorcerers, enters the fray in an unprecedented clash of curses — the Shibuya Incident. In the aftermath, ten colonies across Japan are transformed into dens of curses in a plan orchestrated by Noritoshi Kamo. As the deadly Culling Game starts, Special Grade sorcerer Yuta Okkotsu is assigned to carry out Yuji's execution for his perceived crimes. A compilation movie of Shibuya Incident including the first two episodes of the Culling Games arc.

JUJUTSU KAISEN: Execution

2025

Jujutsu Kaisen 0 poster
8.1

Yuta Okkotsu is a nervous high school student who is suffering from a serious problem—his childhood friend Rika has turned into a curse and won't leave him alone. Since Rika is no ordinary curse, his plight is noticed by Satoru Gojo, a teacher at Jujutsu High, a school where fledgling exorcists learn how to combat curses. Gojo convinces Yuta to enroll, but can he learn enough in time to confront the curse that haunts him?

Jujutsu Kaisen 0

2021

Attack on Titan: THE LAST ATTACK poster
8.7

A colossal-sized omnibus film bringing together the last two episodes of Attack on Titan in the franchise's first-ever theatrical experience. After venturing beyond the walls and separated from his comrades, Eren finds himself inspired by this new truth and plots the "Rumbling," a terrifying plan to eradicate every living thing in the world. With the fate of the world hanging in the balance, a motley crew of Eren's former comrades and enemies scramble to halt his deadly mission. The only question is, can they stop him?

Attack on Titan: THE LAST ATTACK

2024

JUJUTSU KAISEN: Hidden Inventory / Premature Death - The Movie poster
8.6

Pursued by a religious cult and other curse users, former friends Satoru Gojo and Suguru Geto are the only sorcerers capable of carrying the difficult task of protecting Riko Amanai, a student who has been designated to be sacrificed as the Star Plasma Vessel, until she can fulfill her duty.

JUJUTSU KAISEN: Hidden Inventory / Premature Death - The Movie

2025

Twittering Birds Never Fly: The Clouds Gather poster
6.6

In the hyper-masculine criminal underworld, a masochistic high-ranking yakuza and his newly-assigned bodyguard become increasingly drawn to each other.

Twittering Birds Never Fly: The Clouds Gather

2020

Behind the camera

Chainsaw Man - The Movie: Reze Arc poster
8.5

In a brutal war between devils, hunters, and secret enemies, a mysterious girl named Reze has stepped into Denji's world, and he faces his deadliest battle yet, fueled by love in a world where survival knows no rules.

Chainsaw Man - The Movie: Reze Arc

2025

JUJUTSU KAISEN: Execution poster
6.1

A veil abruptly descends over the busy Shibuya area amid the bustling Halloween crowds, trapping countless civilians inside. Satoru Gojo, the strongest jujutsu sorcerer, steps into the chaos. But lying in wait are curse users and spirits scheming to seal him away. Yuji Itadori, accompanied by his classmates and other top-tier jujutsu sorcerers, enters the fray in an unprecedented clash of curses — the Shibuya Incident. In the aftermath, ten colonies across Japan are transformed into dens of curses in a plan orchestrated by Noritoshi Kamo. As the deadly Culling Game starts, Special Grade sorcerer Yuta Okkotsu is assigned to carry out Yuji's execution for his perceived crimes. A compilation movie of Shibuya Incident including the first two episodes of the Culling Games arc.

JUJUTSU KAISEN: Execution

2025

Jujutsu Kaisen 0 poster
8.1

Yuta Okkotsu is a nervous high school student who is suffering from a serious problem—his childhood friend Rika has turned into a curse and won't leave him alone. Since Rika is no ordinary curse, his plight is noticed by Satoru Gojo, a teacher at Jujutsu High, a school where fledgling exorcists learn how to combat curses. Gojo convinces Yuta to enroll, but can he learn enough in time to confront the curse that haunts him?

Jujutsu Kaisen 0

2021

Attack on Titan: THE LAST ATTACK poster
8.7

A colossal-sized omnibus film bringing together the last two episodes of Attack on Titan in the franchise's first-ever theatrical experience. After venturing beyond the walls and separated from his comrades, Eren finds himself inspired by this new truth and plots the "Rumbling," a terrifying plan to eradicate every living thing in the world. With the fate of the world hanging in the balance, a motley crew of Eren's former comrades and enemies scramble to halt his deadly mission. The only question is, can they stop him?

Attack on Titan: THE LAST ATTACK

2024

JUJUTSU KAISEN: Hidden Inventory / Premature Death - The Movie poster
8.6

Pursued by a religious cult and other curse users, former friends Satoru Gojo and Suguru Geto are the only sorcerers capable of carrying the difficult task of protecting Riko Amanai, a student who has been designated to be sacrificed as the Star Plasma Vessel, until she can fulfill her duty.

JUJUTSU KAISEN: Hidden Inventory / Premature Death - The Movie

2025

Twittering Birds Never Fly: The Clouds Gather poster
6.6

In the hyper-masculine criminal underworld, a masochistic high-ranking yakuza and his newly-assigned bodyguard become increasingly drawn to each other.

Twittering Birds Never Fly: The Clouds Gather

2020

The Empire of Corpses poster
6.2

The story takes place in 19th century Europe, and revolves around John Watson. He is scouted by the government to become a secret agent. However, Watson lives in a world where "Frankensteins"—human corpses that are re-purposed with a false soul in order to use them as laborers—are used to improve industrial development.

The Empire of Corpses

2015

Ajin: Demi-Human poster
7.3

Kei Nagai dies in a car accident, but realises he is a type of immortal known as Ajin. Hunted by humans, Ajin is eventually found by the government and used as a subject in cruel experiments. He finds fellow demi-humans along the way as he escapes and goes on the run.

Ajin: Demi-Human

2017

DAN DA DAN: First Encounter poster
7.5

High schoolers Momo and Okarun, who debate about ghosts and aliens, investigate paranormal sites, encountering supernatural forces while awaking hidden powers to face the unknown. Theatrical event featuring the first three episodes of DAN DA DAN, and an exclusive interview with Yukinobu Tatsu and Shihei Lin, the author and editor of the original manga, Fuga Yamashiro (Director), and Shion Wakayama (voice of Momo) and Natsuki Hanae (voice of Okarun).

DAN DA DAN: First Encounter

2024

DAN DA DAN: Evil Eye poster
7.7

Momo and Okarun set out on their latest adventure, traveling to a hot springs town home rented by Jiji, Momo's childhood friend and former crush, with the goal to solve the mystery surrounding his family. When they arrive, strange locals derail their investigation before it can properly begin, and the group soon learns there's more lurking under the surface of the town than they could possibly have imagined. Theatrical event featuring four episodes of the anime, including the first three episodes of the second season, and an exclusive interview with series co-directors Fuga Yamashiro and Abel Góngora.

DAN DA DAN: Evil Eye

2025

Ajin: Demi-Human – Compel poster
7.1

Kei discovers the curse of immortality when he gets hit by a bus... and doesn't die. Now on the run from a government that wants to experiment on him, and his fellow Ajin, Kei's only hope to live a peaceful life lies in his ability to learn how to use his new powers. Aided by the strength of his "Black Ghost", a once apathetic Kei must now fight to avoid becoming a cruel demi-human experiment.

Ajin: Demi-Human – Compel

2015

Twittering Birds Never Fly: Don't Stay Gold poster
6.0

Anime adaptation of the short story "Don't Stay Gold", to be included in volume 7 of the manga.

Twittering Birds Never Fly: Don't Stay Gold

2021

Ajin: Demi-Human – Collide poster
7.2

As Sato’s plan enters its second phase, known as the “Purge,” key political and military figures begin falling one by one. With the operation rapidly advancing toward its final stage, the Japanese government remains steadfast in its refusal to negotiate with terrorists. Behind the scenes, the police, special forces, and even the United States Department of Defense begin making moves of their own. Meanwhile, high school student and fellow Ajin Kei Nagai devises a desperate strategy to stop Sato once and for all—but can he succeed before the final phase begins?

Ajin: Demi-Human – Collide

2016

Ajin: Demi-Human – Confront poster
7.3

As Kei Nagai escapes from the Ajin Research Institute, the true intentions of the mysterious hat-wearing man, Sato, begin to emerge. Meanwhile, Tosaki, the desperate head of the Ajin Management Committee, pursues his own agenda. Their conflicting ambitions intensify the struggle between the Ajin and the Japanese government, drawing society as a whole into the conflict. Answering Sato’s call, seven Ajin gather together, only to be confronted with a shocking new plan.

Ajin: Demi-Human – Confront

2016

Chainsaw Man - Assassins Arc poster
NR

Following the events of the Bomb Girl incident, Denji becomes the target of deadly assassins from around the world seeking the power of Chainsaw Man. As rival hunters, powerful Devils, and international killers converge on Japan, Denji and Public Safety are drawn into a brutal conflict that uncovers dark secrets and pushes them into a terrifying battle beyond human understanding.

Chainsaw Man - Assassins Arc

—

Crunchyroll Anime Nights - Mob Psycho 100 poster
NR

Mob is an 8th grader with powerful psychic abilities who wants to be normal. When not exorcising evil spirits, he attempts to suppress his powers, causing stunted emotions. But when he hits 100 percent, his pent-up feelings unleash a dark power. Can he survive the psychic strain? Theatrical screening of Mob Psycho 100 E11 and E12; Mob Psycho 100 II E7 and OVA; and Mob Psycho 100 III E12.

Crunchyroll Anime Nights - Mob Psycho 100

2026

Mob Psycho 100 poster
8.0

While Shigeo gets closer to his final destination where Tsubomi awaits him, Reigen tries to reach his student to tell him something important.

Mob Psycho 100

2016