1 - 12

EP 1 — Former Great Detective Nagumo Keiichiro / Mashiro's Pest Extermination

EP 2

With Ghosts, Go for the Knees / Find the Real Thief! / Three Minutes Until Mashiro Explodes

08 Jul 2025

With Ghosts, Go for the Knees / Find the Real Thief! / Three Minutes Until Mashiro Explodes

EP 3 — Great Detective Asunaro / The Ones Who Don't Realize They're Stalkers Are the Most Dangerous

HIDDEN SPOILER

EP 3

Great Detective Asunaro / The Ones Who Don't Realize They're Stalkers Are the Most Dangerous

15 Jul 2025

Great Detective Asunaro / The Ones Who Don't Realize They're Stalkers Are the Most Dangerous

EP 4 — Murder at the Mansion of Screams / Maki-chan and the Generation Gap

HIDDEN SPOILER

EP 4

Murder at the Mansion of Screams / Maki-chan and the Generation Gap

22 Jul 2025

Murder at the Mansion of Screams / Maki-chan and the Generation Gap

EP 5 — Welcome to the World of Grown-ups / A Midsummer Thriller / Mashiro and the Agent from the Stars

HIDDEN SPOILER

EP 5

Welcome to the World of Grown-ups / A Midsummer Thriller / Mashiro and the Agent from the Stars

29 Jul 2025

Welcome to the World of Grown-ups / A Midsummer Thriller / Mashiro and the Agent from the Stars

EP 6 — Mashiro Hosts Girls' Night Out / Assistant Switch!! / Battle to the Death at 100° Celsius

HIDDEN SPOILER

EP 6

Mashiro Hosts Girls' Night Out / Assistant Switch!! / Battle to the Death at 100° Celsius

05 Aug 2025

Mashiro Hosts Girls' Night Out / Assistant Switch!! / Battle to the Death at 100° Celsius

EP 7 — Nagumo-san's Grown-up Allure / The Lost Child and Mashiro / The Great Detective vs. Phantom Thief Riverfake

HIDDEN SPOILER

EP 7

Nagumo-san's Grown-up Allure / The Lost Child and Mashiro / The Great Detective vs. Phantom Thief Riverfake

12 Aug 2025

Nagumo-san's Grown-up Allure / The Lost Child and Mashiro / The Great Detective vs. Phantom Thief Riverfake

EP 8 — Nagumo's Cyber Case File / The Phantom Thief's Method / A Detective Assistant's Day Off

HIDDEN SPOILER

EP 8

Nagumo's Cyber Case File / The Phantom Thief's Method / A Detective Assistant's Day Off

19 Aug 2025

Nagumo's Cyber Case File / The Phantom Thief's Method / A Detective Assistant's Day Off

EP 9 — Take Good Care of Your Smartphone / Maki-chan and Asunaro

HIDDEN SPOILER

EP 9

Take Good Care of Your Smartphone / Maki-chan and Asunaro

26 Aug 2025

Take Good Care of Your Smartphone / Maki-chan and Asunaro

HIDDEN SPOILER

EP 10

Catch the Sneak Photographer! / The Bullet Bride

02 Sep 2025

10.

Catch the Sneak Photographer! / The Bullet Bride

HIDDEN SPOILER

EP 11

Mashiro and the Psychic of Love

09 Sep 2025

11.

Mashiro and the Psychic of Love

HIDDEN SPOILER

EP 12

Nagumo Dons the Haori / Producing Nagumo Detective Agency / Nagumo Detective Agency Shuts Down

16 Sep 2025

12.

Nagumo Dons the Haori / Producing Nagumo Detective Agency / Nagumo Detective Agency Shuts Down

7. Nagumo-san's Grown-up Allure / The Lost Child and Mashiro / The Great Detective vs. Phantom Thief Riverfake

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TRAILER

Detectives These Days Are Crazy!

Mattaku Saikin no Tantei to Kitara

Comedy Mystery

Nagumo Keiichirou was a genius high-school detective. No case was complex enough for him. But what happens to genius detectives when they get older?

Now 35, with bad hips, running a failing detective agency with no cases to solve and struggling to pay the rent, he's at a dead end.

In comes a high school girl in his office who says she wants to work with him. With her help, will the out-of-touch, old-fashioned Nagumo get back the fire of his youth?

Format: TV

Status: Completed

Episodes: 12

Rating: 71/100

Duration: 24 min

Season: Summer

Start Date: July 1, 2025

End Date: September 16, 2025

Country: Japan

Adult: No

Studios: LIDENFILMS

Official Site: mattan-anime.com

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