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Human Specimens

Human Specimens

Drama
Mystery
Crime
December 19, 2025 (began last year)
6.0/10
Ended
1 Season
5 Episodes
Prime Video
Stream on
Amazon

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

Key Crew

Ryuichi Hiroki

Director

Ryuichi Hiroki

Age 71 (now 72)

Nami Kikkawa

Writer

Nami Kikkawa

Hidetoshi Nishijima
Hidetoshi Nishijima

Hidetoshi Nishijima

Professor Shiro Sakaki

Age 54 (now 55)

5 eps
Somegoro Ichikawa
Somegoro Ichikawa

Somegoro Ichikawa

Itaru Sakaki

Age 20 (now 21)

5 eps
Rie Miyazawa
Rie Miyazawa

Rie Miyazawa

Rumi Ichinose

Age 52 (now 53)

5 eps
Aoi Ito
Aoi Ito

Aoi Ito

Anna Ichinose

Age 20

5 eps
Towa Araki
Towa Araki

Towa Araki

Toru Shirase

Age 20

5 eps
Jyutaro Yamanaka
Jyutaro Yamanaka

Jyutaro Yamanaka

Hikaru Akabane

Age 23 (now 24)

5 eps
Kodai Kurosaki
Kodai Kurosaki

Kodai Kurosaki

Sho Ishioka

Age 23 (now 24)

5 eps
Leo Matsumoto
Leo Matsumoto

Leo Matsumoto

Ao Fukazawa

Age 25 (now 26)

5 eps
Ikuho Akiya
Ikuho Akiya

Ikuho Akiya

Dai Kuroiwa

Age 21 (now 22)

5 eps
Jun Murakami
Jun Murakami

Jun Murakami

Ichiro Sakaki

Age 52

4 eps
Yurina Tsubaki
Yurina Tsubaki

Yurina Tsubaki

Age 37

4 eps
Aoba Kawai
Aoba Kawai

Aoba Kawai

Kozue Sakaki

Age 44

3 eps
Yura Kimura
Yura Kimura

Yura Kimura

Shiro Sakaki (young)

Age 9 (now 10)

3 eps
Yasushi Fuchikami
Yasushi Fuchikami

Yasushi Fuchikami

Detective Narumi

Age 41 (now 42)

3 eps
Shunsuke Tanaka
Shunsuke Tanaka

Shunsuke Tanaka

Detective Katagiri

Age 35 (now 36)

3 eps
Miwako Ichikawa
Miwako Ichikawa

Miwako Ichikawa

Sawako Ichinose

Age 49 (now 50)

2 eps