Professor Shiro Sakaki, a butterfly researcher, confesses to turning six young boys, including his own son Itaru, into "human specimens."
Human Specimens is a 2025 drama and mystery TV series from the United States starring Hidetoshi Nishijima, Somegoro Ichikawa and Rie Miyazawa. It first aired on December 19, 2025. The series has 1 season and 5 episodes on Prime Video.
Human Specimens premiered on December 19, 2025.
The main cast includes Hidetoshi Nishijima, Somegoro Ichikawa, Rie Miyazawa, Aoi Ito and Towa Araki.
Human Specimens has 1 season (5 episodes). Status: Ended.
No streaming service lists it for US yet. Add it to your watchlist and check back — availability updates regularly.
Every episode's audience rating at a glance — find the best (and worst) episodes before you binge.
| E1 | E2 | E3 | E4 | E5 | |
|---|---|---|---|---|---|
| S1 | 6.0 | 6.0 | 6.0 | 6.0 | 7.0 |
9+ Awesome8+ Great7+ Good6+ Regular<6 Bad
based on novel or bookbutterflypsychologicalthriller
Amazon Prime Video 
Amazon Prime Video with Ads 
Hidetoshi Nishijima
Somegoro Ichikawa
Rie Miyazawa
Aoi Ito
Towa Araki
Jyutaro Yamanaka
Kodai Kurosaki
Leo Matsumoto
Ikuho Akiya