Human Specimens

Human Specimens

人間標本
Ended First aired 19/Dec/2025 Japan Japanese 1 season(s) 5 episode(s)
DramaMysteryCrime
Professor Shiro Sakaki, a butterfly researcher, confesses to turning six young boys, including his own son Itaru, into "human specimens."
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TimeScore 33% Skip It
Binge Meter 48% Slow Burn
Episode Pulse Quiet 40% activity score
Drop Rate 0% Very Low

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Seasons & Episodes

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Season 1 · Miniseries
5 episode(s) · Air date: 19/Dec/2025
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Season Overview

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S1E5
Episode 5
Air date: 19/Dec/2025 · Runtime: 63 min
Summary

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.

Summary

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.

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S1E4
Episode 4
Air date: 19/Dec/2025 · Runtime: 46 min
Summary

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.

Summary

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.

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S1E3
Episode 3
Air date: 19/Dec/2025 · Runtime: 47 min
Summary

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.

Summary

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.

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S1E2
Episode 2
Air date: 19/Dec/2025 · Runtime: 46 min
Summary

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.

Summary

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.

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S1E1
Episode 1
Air date: 19/Dec/2025 · Runtime: 56 min
Summary

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.

Summary

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.

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Cast

Main cast members.

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Hidetoshi Nishijima
Hidetoshi Nishijima
Professor Shiro Sakaki
Somegoro Ichikawa
Somegoro Ichikawa
Itaru Sakaki
Rie Miyazawa
Rie Miyazawa
Rumi Ichinose
Aoi Ito
Aoi Ito
Anna Ichinose
Towa Araki
Towa Araki
Toru Shirase
Jyutaro Yamanaka
Jyutaro Yamanaka
Hikaru Akabane
Kodai Kurosaki
Kodai Kurosaki
Sho Ishioka
Leo Matsumoto
Leo Matsumoto
Ao Fukazawa
Ikuho Akiya
Ikuho Akiya
Dai Kuroiwa
Jun Murakami
Jun Murakami
Ichiro Sakaki
Aoba Kawai
Aoba Kawai
Kozue Sakaki
Miwako Ichikawa
Miwako Ichikawa
Sawako Ichinose
Hideaki Murata
Hideaki Murata
Kimihiko Ichinose
Yoshinari Furuya
Yoshinari Furuya
Police officer at the local station
Yua Shiraishi
Yua Shiraishi
Shiro Sakaki's student
Yurina Tsubaki
Yurina Tsubaki
Eri Ota
Eri Ota
Yura Kimura
Yura Kimura
Shiro Sakaki (young)

Crew

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No Photo
Asami Kiyokawa
Art Direction
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Atsuhiro Nabeshima
Director of Photography
Ryuichi Hiroki
Ryuichi Hiroki
Director
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Rikimaru Sakuragi
Original Music Composer
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Yaffle
Original Music Composer
Kanae Minato
Kanae Minato
Novel
Nami Kikkawa
Nami Kikkawa
Screenplay

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