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Special Investigation Nine

Latest episode

S8 E10

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About Special Investigation Nine

Special Investigation Nine is a drama TV series that premiered on tv asahi on April 11, 2018. It has 8 seasons and 85 episodes so far and is still airing new episodes. The latest episode, Season 8 Episode 10, aired on June 11, 2025.

The #9 investigation team has been disbanded and members of the #9 investigation team have been scattered around. One year later, the Chief of the National Police Agency, Sojiro Kandagawa, orders the creation of a special investigation team to cover from the initial investigation until it is sent to the prosecutor's office. Sojiro Kandagawa appoints Sakutaro Munakata as the leader of the special investigation team. Former #9 investigation team members join the special investigation team.

  • Drama

Last updated

Episodes

85 episodes · 8 seasons

Season 1

2018 · 10 episodes · Last episode: 8 years ago

Special Investigation Nine Season 1 release dates →
  1. Special Investigation Nine S1 E10 still E10

    10. 3 Murders

    Finale

    Takamori Tetsuya, the Minister of Justice, has reportedly been killed. Naoki rushes to the scene only to find out that the murder victim is actually Takamori's wife Shizue, confusing everyone. Adachi Yoshio discovers the apparentl murder weapon. They conclude that someone with a grudge against Takamori killed Shizue by mistake. However, the disguise of the criminal was discovered and it's believed that Shizue is actually the target. Meanwhile, the truth of Munakata's past comes to light.

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    9. Serial Killer X

    A 75 year old woman is found beaten and murdered in an Itabashi Ward park. Naoki notices that the body has swollen unnatural. In the victim's mouth, the find a fake police badge. Is the killer taunting the police? Additionally, in this same jurisdiction, there were two other murder cases where fake badges were found. Naoki reaches a shocking truth...

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    8. Infinity of Murder

    The body of Yasuko, the wife of company president Mizukami Yojiro, is found their home pool. However, a v-shaped wound is found on her forehead and the home seems have been robbed. The suspects are numerous. Yasuko was disliked for trying to ensure her son will be her husband's successor while also harassing their maid, Nana. A strange paper with an infinity mark is found in Yasuko's room.

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    7. Banknote Killing

    The body of Nishida Masayoshi, the president of a real estate company, is found by the steps of a shrine. Nakajima Tatsuya, an employee, is found unconscious on top of the body. The strangest part is the 10,000 yen bills scattered around them. It's revealed that Nishida was beaten to death. A third man is suspected as being involved.

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    6. Red Flower Murder

    The stabbed body of talent movie producer, Kondo Rumi, was discovered. She's seemingly been struck on her right cheek and is holding an unfamiliar red flower. Certain facts emerge regarding the movie she was working on and the team pursue questioning of several people involved in the movie.

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    5. Harmonica Murder

    A corpse of a puppeteer, Mitsuhashi Ryoko, is discovered by an elementary school student named Shibata Keita. Ryoko was famous for disliking children and was thus tied to Sakai Nanako, a school club instructor often visiting Ryoko's home due to complaints from parents. The team discovers shocking facts regarding the apparently accidental death of Ryoko's husband. A shocking truth emerges...

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    4. Corpse Under the Floor

    When freelance writer, Miyoshi Kanako, is redecorating his home, a body is found under the floor by contractor Murata Hajime. According to Inori of the forensics department, the body is male and has been dead for over 5 years. Kanako's father is former deputy captain Taizo, now suffering from dementia and of no help due to his loss of memory. Surprisingly, Taizo seemingly regains his memory and confesses that it was him...

  8. Special Investigation Nine S1 E3 still E3

    3. Murdered City Planning

    The stabbed body of Morita Akiko, a popular architect, is found. She was participating in a design competition but her design model has been destroyed by someone. The murderer may be Oya Genji, another architect also participating in the competition. After discovering cause of death, they further believe he may have been behind it. However, they soon gets new facts in the case that may point to someone else...

  9. Special Investigation Nine S1 E2 still E2

    2. Bride disappeared

    The body of a woman in a wedding dress was found. When Naoki and the others arrive, they are informed that it may have been a suicide by pills. The identity of the body is Saito Maki, the missing concierge of a hotel. She was supposed to be married to Takemura Shigeaki, the front desk clerk of the same hotel. According to Takemura, Maki was staying alone ahead of their ceremony. Naoki and his colleagues check the security cameras but find nothing. The mystery deepens as they discover that Maki was suspicious that Takemura may have been cheating, offering a motive for the apparent suicide.

  10. Special Investigation Nine S1 E1 still E1

    1. 10,000 years murder

    Asawa Naoki chases a robber who escapes after robbing a jewelry store with a handgun. He suddenly runs into Shindo Ryo who begins chasing the robber with him. Naoki manages to grab the robber without any harm to the general public. The next day, while talking to his wife, Rinko, he receives a call. He heads to the police superintendent's office and is informed by Kandagawa, the police chief, that he will be forming a special investigation team.

Season 2

2019 · 11 episodes · Last episode: 7 years ago

Special Investigation Nine Season 2 release dates →
  1. Special Investigation Nine S2 E11 still E11

    11. Episode 11

    Finale
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    10. Episode 10

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    9. Episode 9

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    8. Episode 8

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    7. Episode 7

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    6. Episode 6

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    5. Episode 5

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    4. Episode 4

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    3. Episode 3

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    2. Episode 2

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    1. Episode 1

Season 3

2020 · 10 episodes · Last episode: 6 years ago

Special Investigation Nine Season 3 release dates →
  1. Special Investigation Nine S3 E10 still E10

    10. Episode 10

    Finale
  2. Special Investigation Nine S3 E9 still E9

    9. Episode 9

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    8. Episode 8

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    7. Episode 7

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    6. Episode 6

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    5. Episode 5

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    4. Episode 4

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    3. Episode 3

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    2. Episode 2

  10. Special Investigation Nine S3 E1 still E1

    1. Episode 1

Season 4

2021 · 13 episodes · Last episode: 5 years ago

New enemies appear to block the Tokusou 9. As in the past, the Tokusou 9 hold on to their belief that "the case will be solved at all costs" and put their all into solving cases.

Special Investigation Nine Season 4 release dates →
  1. E13

    13. Episode 13

    Finale
  2. Special Investigation Nine S4 E12 still E12

    12. Episode 12

  3. Special Investigation Nine S4 E11 still E11

    11. Episode 11

  4. Special Investigation Nine S4 E10 still E10

    10. Episode 10

  5. Special Investigation Nine S4 E9 still E9

    9. Flying Suspect

  6. Special Investigation Nine S4 E8 still E8

    8. Hedgehog in a Locked Room

  7. Special Investigation Nine S4 E7 still E7

    7. Murder Puzzle

  8. Special Investigation Nine S4 E6 still E6

    6. Cursed Picture

  9. Special Investigation Nine S4 E5 still E5

    5. Killing Blueprint

  10. Special Investigation Nine S4 E4 still E4

    4. Prayer

  11. Special Investigation Nine S4 E3 still E3

    3. Best Day

  12. Special Investigation Nine S4 E2 still E2

    2. Murder Designer

  13. Special Investigation Nine S4 E1 still E1

    1. Gray Suspect

    A young woman's stabbed body is found about 10 days after her death in a vacant store in a multi tenant building. The Tokusou team begin investigating, discovering her identity and the fact she promised to meet a man on the day of her death. Meanwhile, the suspect of a murder-robbery case is claiming he saw someone else do the crime.

Season 5

2022 · 12 episodes · Last episode: 4 years ago

Special Investigation Nine Season 5 release dates →
  1. Special Investigation Nine S5 E12 still E12

    12. Episode 12

    Finale
  2. Special Investigation Nine S5 E11 still E11

    11. Episode 11

  3. Special Investigation Nine S5 E10 still E10

    10. Episode 10

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    9. Episode 9

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    8. Episode 8

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    7. Episode 7

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    6. Episode 6

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    5. Episode 5

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    4. Episode 4

  10. Special Investigation Nine S5 E3 still E3

    3. Episode 3

  11. Special Investigation Nine S5 E2 still E2

    2. Episode 2

  12. Special Investigation Nine S5 E1 still E1

    1. Episode 1

Season 6

2023 · 9 episodes · Last episode: 3 years ago

Special Investigation Nine Season 6 release dates →
  1. E9

    9. Episode 9

  2. E8

    8. Episode 8

  3. E7

    7. Episode 7

  4. E6

    6. Episode 6

  5. E5

    5. Episode 5

  6. E4

    4. Episode 4

  7. E3

    3. Episode 3

  8. E2

    2. Episode 2

  9. E1

    1. Episode 1

Season 7

2024 · 10 episodes · Last episode: 2 years ago

Special Investigation Nine Season 7 release dates →
  1. E10

    10. Episode 10

  2. E9

    9. Episode 9

  3. E8

    8. Episode 8

  4. E7

    7. Episode 7

  5. E6

    6. Episode 6

  6. E5

    5. Episode 5

  7. E4

    4. Episode 4

  8. E3

    3. Episode 3

  9. E2

    2. Episode 2

  10. E1

    1. Episode 1

Season 8

2025 · 10 episodes · Last episode: 1 year ago

Special Investigation Nine Season 8 release dates →
  1. E10

    10. Episode 10

  2. E9

    9. Episode 9

  3. E8

    8. Episode 8

  4. E7

    7. Episode 7

  5. E6

    6. Episode 6

  6. E5

    5. Episode 5

  7. E4

    4. Episode 4

  8. E3

    3. Episode 3

  9. E2

    2. Episode 2

  10. E1

    1. Episode 1

Cast & crew

  • Kumiko Endo

    Kumiko Endo

    Taeko Kakiuchi

  • Nao Osada

    Nao Osada

    Kanzaki Satsuki

  • Meguri Hiroo

    Meguri Hiroo

    Otani Seizo

  • Keigo Dei

  • Chika Oura

    Soga Keiko (Nurse)

  • Eriko Sato

    Eriko Sato

    Chihiro Takamine

  • HaLuki Nanai

    HaLuki Nanai

    Withdrawer

  • Yuji Kubo

    Yuji Kubo

    Man

  • Ryo Sato

    Ryo Sato

    Aoyama Kaori

  • Rinta

    Rinta

    Kazuto Shimazaki

  • Yoko Mitsuya

    Yoko Mitsuya

    Koga Yuko

  • Ichirôta Miyakawa

    Ichirôta Miyakawa

    Hiromitsu Ide

  • Izumi Kasagi

    Izumi Kasagi

    Takako Tomioka

  • Shigehiro Yamaguchi

    Shigehiro Yamaguchi

    Toshiya Naganawa

  • Misaki Rion

    Misaki Rion

    Miho Nomura

  • Keiko Kawaguchi

    Munataka

Special Investigation Nine FAQ

When is the next episode of Special Investigation Nine?

A date for the next episode of Special Investigation Nine hasn't been announced yet. Follow Special Investigation Nine in the Streambay app and you'll be notified as soon as a new episode airs.

When did the latest episode of Special Investigation Nine come out?

The most recent episode of Special Investigation Nine, Season 8 Episode 10, aired on June 11, 2025.

How many seasons of Special Investigation Nine are there?

Special Investigation Nine has 8 seasons with 85 episodes in total.

When did Special Investigation Nine first air?

Special Investigation Nine first aired on tv asahi on April 11, 2018.

How do I get notified when new episodes of Special Investigation Nine are released?

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

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