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!
Cast: Junichi Suwabe, Kana Hanazawa, Kengo Kawanishi
Season 1
12 episodes
1. Former Great Detective Nagumo Keiichiro / Mashiro's Pest ExterminationNagumo Keiichiro was once a great child detective, but age is starting to catch up with him.14CCJul 1, 2025
2. With Ghosts, Go for the Knees / Find the Real Thief! / Three Minutes Until Mashiro ExplodesMashiro's schoolmate seeks the agency's help in catching a ghost, and Nagumo is suspected of underwear theft.14CC24minJul 8, 2025
3. Great Detective Asunaro / The Ones Who Don't Realize They're Stalkers Are the Most DangerousA young detective lockpicks his way into Nagumo's office and asks to work for him.14CC24minJul 15, 2025
4. Murder at the Mansion of Screams / Maki-chan and the Generation GapNagumo is invited to a dinner party at a stately old mansion... where a mass murder once took place.14CC24minJul 22, 2025
5. Welcome to the World of Grown-Ups / A Midsummer Thriller / Mashiro and the Agent from the StarsNagumo takes Mashiro to his favorite bar to give her a taste of grown-up society.14CC24minJul 29, 2025
6. Mashiro Hosts Girls' Night Out / Assistant Switch!! / Battle to the Death at 100° CelsiusMashiro spends an evening with Azuha and Maki. Later, Nagumo and Asunaro switch partners.14CC24minAug 5, 2025
7. Nagumo-san's Grown-Up Allure / The Lost Child and Mashiro / The Great Detective vs. Phantom Thief RiverfakeMashiro brings back a lost little girl... and finds out there's more to her than meets the eye.14CC24minAug 12, 2025
8. Nagumo's Cyber Case File / The Phantom Thief's Method / A Detective Assistant's Day OffThe gang tries to sniff out a cyber criminal who's brainwashing people through online videos.14CC24minAug 19, 2025
9. Take Good Care of Your Smartphone / Maki-chan and AsunaroMashiro loses her smartphone, and Asunaro recounts how he and Maki became partners.14CC24minAug 26, 2025
10. Catch the Sneak Photographer! / The Bullet BrideNagumo receives a case of someone taking indecent photos of women at a water park.14CC24minSep 2, 2025
11. Mashiro and the Psychic of LoveA client asks Nagumo to save his wife from a psychic who seems to have brainwashed his village.14CC24minSep 9, 2025
12. Nagumo Dons the Haori / Producing Nagumo Detective Agency / Nagumo Detective Agency Shuts DownCan the gang make enough money to pay off Nagumo's overdue rent and save Nagumo Detective Agency?14CC24minSep 16, 2025
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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!
Creators and cast
- Created by
- Saho Ito, Sho Tanaka, Yuichiro Kubo, Naoki Iijima
- Studio
- LIDENFILMS, Ultra Super Pictures, KADOKAWA
Maturity rating
14Check the rating before watching with younger viewers.
