Once a legendary detective, Nagumo Keiichiro now stumbles through middle age baffled by smartphones and modern life. His quiet decline gets disrupted when Mashiro, a bold high school girl, bursts into his office demanding to become his apprentice. Though he’s rusty and set in his ways, her relentless enthusiasm drags him back into detective work. Now the gap-bridging detective duo is on the case!
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Junichi Suwabe
Keiichiro Nagumo (voice)
Kana Hanazawa
Mashiro (voice)
Kengo Kawanishi
Taro Nezu (voice)
Tomokazu Sugita
Cheerful Old Man / Nipple-Tasting Man / Cross Chest Hair Man / Man Who Likes Ropes (voice)
All 12 episodes plotted by IMDb rating
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12 episodes • 2025Avg: 7.6Golden Era
| # | Episode | Air Date | Rating |
|---|---|---|---|
| 1 | Former Great Detective Nagumo Keiichiro / Mashiro's Pest Extermination | Jul 1, 2025 | 8.0 |
| 2 | With Ghosts, Go for the Knees / Find the Real Thief! / Three Minutes Until Mashiro Explodes | Jul 8, 2025 | 8.2 |
| 3 | Great Detective Asunaro / The Ones Who Don't Realize They're Stalkers Are the Most Dangerous | Jul 15, 2025 | 8.6 |
| 4 | Murder at the Mansion of Screams / Maki-chan and the Generation Gap | Jul 22, 2025 | 7.3 |
| 5 | Welcome to the World of Grown-Ups / A Midsummer Thriller / Mashiro and the Agent from the Stars | Jul 29, 2025 | 7.3 |
| 6 | Mashiro Hosts Girls' Night Out / Assistant Switch!! / Battle to the Death at 100° Celsius | Aug 5, 2025 | 7.7 |
| 7 | Nagumo-san's Grown-Up Allure / The Lost Child and Mashiro / The Great Detective vs. Phantom Thief Riverfake | Aug 12, 2025 | 7.7 |
| 8 | Nagumo's Cyber Case File / The Phantom Thief's Method / A Detective Assistant's Day Off | Aug 19, 2025 | 7.3 |
| 9 | Take Good Care of Your Smartphone / Maki-chan and Asunaro | Aug 26, 2025 | 7.7 |
| 10 | Catch the Sneak Photographer! / The Bullet Bride | Sep 2, 2025 | 7.3 |
| 11 | Mashiro and the Psychic of Love | Sep 9, 2025 | 7.0 |
| 12 | Nagumo Dons the Haori / Producing Nagumo Detective Agency / Nagumo Detective Agency Shuts Down | Sep 16, 2025 | 7.3 |
