Human Specimens (2025)

SERIES

20251 Season6.2

Drama, Mystery, Crime

TMDB6.2

Votes4

Your rating

Genre: Drama
Origin: JP

About

Professor Shiro Sakaki, a butterfly researcher, confesses to turning six young boys, including his own son Itaru, into "human specimens."

Where to watch

Region

Stream

Amazon Prime Video

Amazon Prime Video with Ads

Availability from JustWatch via TMDB.

Details

Status: Ended
First aired: Dec 19, 2025
Network: Prime Video
Studio: Amazon MGM Studios, Darwin

Time to finish

4 hrs

5 episodes. About 1 week at an hour a night.

View on IMDb ↗

Cast

Hidetoshi Nishijima

Professor Shiro Sakaki

Somegoro Ichikawa

Itaru Sakaki

Rie Miyazawa

Rumi Ichinose

Aoi Ito

Anna Ichinose

Towa Araki

Toru Shirase

Jyutaro Yamanaka

Hikaru Akabane

Kodai Kurosaki

Sho Ishioka

Leo Matsumoto

Ao Fukazawa

Ikuho Akiya

Dai Kuroiwa

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SERIES

20251 Season6.2

Drama, Mystery, Crime

TMDB6.2

Votes4

Your rating

Genre: Drama
Origin: JP

About

Professor Shiro Sakaki, a butterfly researcher, confesses to turning six young boys, including his own son Itaru, into "human specimens."

Where to watch

Region

Stream

Amazon Prime Video

Amazon Prime Video with Ads

Availability from JustWatch via TMDB.

Episodes

0 of 0 watched

E1 · Airs Dec 19, 2025 · 56m · ★ 6.0
Episode 1
The bodies of young boys were found in six cases. Shiro Sakaki, a professor considered Japan's leading expert on butterflies, turns himself in. He has recorded everything in a report published on the Internet, from his motive to the process of his creation. The interrogation proceeds as if tracing his distorted record, leading to a sensational suspense story where beauty and madness intertwine.
E2 · Airs Dec 19, 2025 · 46m · ★ 6.0
Episode 2
Shiro starts to express his artistic viewpoint during interrogation. The art camp is canceled when Rumi falls ill. Shiro goes to the mountain to take the boys home. In the warehouse, there are six cases on display. Shiro feels emotional upheaval due to his expectations toward Itaru. As the detective investigates further, a big mystery arises, and the interrogation gets to the crux of his story.
E3 · Airs Dec 19, 2025 · 47m · ★ 6.0
Episode 3
After creating five specimens, Shiro's final target is his beloved son, Itaru. Despite the memories with Itaru, Shiro only sees his son as a butterfly. Shiro makes up his mind to create his last specimen. At last, the report named "Human Specimen by Shiro Sakaki" seems to have ended. However, the letters in the report start to get distorted, and the story shifts to a new perspective.
E4 · Airs Dec 19, 2025 · 46m · ★ 6.0
Episode 4
Itaru stays home while Shiro leaves for an observation survey of butterflies. Itaru stares at his father's specimens and invites his friends over. He starts recording his observations in his own report. When Shiro returns, they have dinner and share memories. Shiro opens his son's computer with a strange feeling about the specimens in his room.Three years later, Shiro receives a letter from Anna.
E5 · Airs Dec 19, 2025 · 1h 3m · ★ 7.0
Episode 5
Anna seemed proud, but she longed for a successor while looking at her mother, in the spotlight for her art book. After the art camp is canceled, Anna invites the boys to the mountain house. She insists she made the Human Specimen. Shiro understands Itaru's hopes to become his father's specimen. The truth of Itaru's death and the mystery of Anna's confession will be unraveled.

Details

Status: Ended
First aired: Dec 19, 2025
Network: Prime Video
Studio: Amazon MGM Studios, Darwin

Time to finish

4 hrs

5 episodes. About 1 week at an hour a night.

View on IMDb ↗

Cast

Hidetoshi Nishijima

Professor Shiro Sakaki

Somegoro Ichikawa

Itaru Sakaki

Rie Miyazawa

Rumi Ichinose

Aoi Ito

Anna Ichinose

Towa Araki

Toru Shirase

Jyutaro Yamanaka

Hikaru Akabane

Kodai Kurosaki

Sho Ishioka

Leo Matsumoto

Ao Fukazawa

Ikuho Akiya

Dai Kuroiwa

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20267.4

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20206.6

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