Skip to content
Streambay
Human Specimens poster
TV series

Human Specimens

Latest episode

S1 E5

About Human Specimens

Human Specimens is a mystery and drama TV series that premiered on Prime Video on December 19, 2025. It has 1 season and 5 episodes so far and has ended. The latest episode, Season 1 Episode 5, aired on December 19, 2025.

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

  • Mystery
  • Drama
  • Crime

Last updated

Episodes

5 episodes · 1 season

Miniseries

2025 · 5 episodes · Last episode: 10 months ago

Human Specimens Miniseries release dates →
  1. Human Specimens S1 E5 still E5

    5. Episode 5

    Finale

    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.

  2. Human Specimens S1 E4 still E4

    4. 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.

  3. Human Specimens S1 E3 still E3

    3. 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.

  4. Human Specimens S1 E2 still E2

    2. 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.

  5. Human Specimens S1 E1 still E1

    1. 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.

Cast & crew

  • 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)

  • Renwa Sato

    Renwa Sato

    Rumi Ichinose (young)

  • Yasushi Fuchikami

    Yasushi Fuchikami

    Detective Narumi

  • Shunsuke Tanaka

    Shunsuke Tanaka

    Detective Katagiri

  • Tomorowo Taguchi

    Tomorowo Taguchi

    Man walking his dog

  • Mitsuyo Tsukada

    Mitsuyo Tsukada

    Toru Shirase's grandmother

  • Kaori Takeshita

    Kaori Takeshita

    Mieko (Dai Kuroiwa's fan)

  • Hina Michikita

    Hina Michikita

    High school student

Human Specimens FAQ

Will there be new episodes of Human Specimens?

Human Specimens has ended, so no new episodes are scheduled. The final episode aired on December 19, 2025.

When did the latest episode of Human Specimens come out?

The most recent episode of Human Specimens, Season 1 Episode 5, aired on December 19, 2025.

How many seasons of Human Specimens are there?

Human Specimens has 1 season with 5 episodes in total.

When did Human Specimens first air?

Human Specimens first aired on Prime Video on December 19, 2025.

How do I get notified when new episodes of Human Specimens are released?

Download the Streambay app, follow Human Specimens, and you'll get a push notification the moment each new episode is released.

More like Human Specimens

  • Law & Order: Special Victims Unit poster

    8.0

    S28 · E4 1 week ago

    Law & Order: Special Victims Unit

    Synopsis: In the criminal justice system, sexually-based offenses are considered especially heinous. In New York City, the dedicated detectives who investigate these vicious felonies are members of an elite squad known as the Special Victims Unit. These are their stories.

  • The Mentalist poster

    8.4

    S7 · E13 11 years ago

    The Mentalist

    Synopsis: Patrick Jane, a former celebrity psychic medium, uses his razor sharp skills of observation and expertise at "reading" people to solve serious crimes with the California Bureau of Investigation.

  • C.I.D. poster

    5.7

    S2 · E104 10 months ago

    C.I.D.

    Synopsis: A team of dedicated men and women in the Crime Investigation Department will risk everything to solve Mumbai's toughest, most complicated crimes.

  • CSI: Crime Scene Investigation poster

    7.6

    S15 · E18 11 years ago

    CSI: Crime Scene Investigation

    Synopsis: A Las Vegas team of forensic investigators are trained to solve criminal cases by scouring the crime scene, collecting irrefutable evidence and finding the missing pieces that solve the mystery.

  • Criminal Minds poster

    8.3

    S19 · E10 3 months ago

    Criminal Minds

    Synopsis: An elite team of FBI profilers analyze the country's most twisted criminal minds, anticipating their next moves before they strike again. The Behavioral Analysis Unit's most experienced agent is David Rossi, a founding member of the BAU who returns to help the team solve new cases.

  • Slow Horses poster

    8.1

    S6 · E6 2 weeks ago

    Slow Horses

    Synopsis: Follow a dysfunctional team of MI5 agents—and their obnoxious boss, the notorious Jackson Lamb—as they navigate the espionage world's smoke and mirrors to defend England from sinister forces.

  • CSI: Miami poster

    7.7

    S10 · E19 14 years ago

    CSI: Miami

    Synopsis: The show follows Crime Scene Investigators working for the Miami-Dade Police Department as they use physical evidence, similar to their Las Vegas counterparts, to solve grisly murders. The series mixes deduction, gritty subject matter, and character-driven drama in the same vein as the original series in the CSI franchise, except that the Miami CSIs are cops first, scientists second.

  • The Blacklist poster

    7.6

    S10 · E22 3 years ago

    The Blacklist

    Synopsis: Raymond "Red" Reddington, one of the FBI's most wanted fugitives, surrenders in person at FBI Headquarters in Washington, D.C. He claims that he and the FBI have the same interests: bringing down dangerous criminals and terrorists. In the last two decades, he's made a list of criminals and terrorists that matter the most but the FBI cannot find because it does not know they exist. Reddington calls this "The Blacklist". Reddington will co-operate, but insists that he will speak only to Elizabeth Keen, a rookie FBI profiler.

  • Perry Mason poster

    7.7

    S9 · E30 60 years ago

    Perry Mason

    Synopsis: The cases of master criminal defense attorney Perry Mason and his staff who handled the most difficult of cases in the aid of the innocent.

  • Midsomer Murders poster

    7.5

    S24 · E2 10 months ago

    Midsomer Murders

    Synopsis: The peacefulness of the Midsomer community is shattered by violent crimes, suspects are placed under suspicion, and it is up to a veteran DCI and his young sergeant to calmly and diligently eliminate the innocent and ruthlessly pursue the guilty.

  • NCIS: Los Angeles poster

    7.5

    S14 · E21 3 years ago

    NCIS: Los Angeles

    Synopsis: The exploits of the Los Angeles–based Office of Special Projects (OSP), an elite division of the Naval Criminal Investigative Service that specializes in undercover assignments.

  • Dexter poster

    8.2

    S8 · E12 13 years ago

    Dexter

    Synopsis: Dexter Morgan, a blood spatter pattern analyst for the Miami Metro Police also leads a secret life as a serial killer, hunting down criminals who have slipped through the cracks of justice.

Never miss Human Specimens.

Download Streambay and follow Human Specimens. We’ll notify you the moment a new episode is released. It’s free, with no sign-up and no personal information required.

Coming soon to App Store Get it on Google Play
Human Specimens Get new episode alerts Get alerts