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Season 1 – Human Specimens

Play trailer Poster for Season 1 – Human Specimens Dec 2025 Mystery & Thriller Play Trailer Watchlist
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Professor Shiro Sakakil, a butterfly researcher, confesses to turning six young boys, including his own son Itaru, into human specimens.
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Human Specimens — Season 1

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Syn I. @synirios Feb 7 Very interesting concept. See more Read all reviews
Human Specimens — Season 1

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Cast & Crew

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Hidetoshi Nishijima

Actor

Ichikawa Somegoro VIII

Actor

Rie Miyazawa

Actor

Aoi Itô

Actor

Ryuichi Hiroki

Director

Episodes

Episode 1 Aired Dec 19, 2025 In midsummer, bodies of young boys are found in six acrylic cases in the mountains; Shiro Sakakil, 50, a university professor and Japan's leading butterfly expert, turns himself in. Details Episode 2 Aired Dec 19, 2025 Shiro passionately expresses his artistic viewpoint, but the art camp is canceled due to Rumi's worsening condition; he returns to the mountain to take the boys home, where six acrylic cases are on display in the warehouse. Details Episode 3 Aired Dec 19, 2025 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; the story shifts to a new perspective. Details Episode 4 Aired Dec 19, 2025 Itaru stays home while Shiro leaves for an observation survey; Itaru stares at the specimens and invites his friends; Shiro opens his son's computer with a strange feeling about the specimens; three years later, Shiro receives a letter from Anna. Details Episode 5 Aired Dec 19, 2025 Anna seemed proud, but longed for a successor while looking at her mother, in the spotlight; she insists she made the Human Specimen; the truth of Itaru's death and the mystery of Anna's confession unravels. Details
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Human Specimens — Season 1

Human Specimens Human Specimens Human Specimens View more photos

Season Info

Director
Ryuichi Hiroki
Network
Prime Video
Genre
Mystery & Thriller
Original Language
Japanese
Release Date
Dec 19, 2025