Season 1
12 episodes · first aired 2025-07-01
| Still | # | Title | Overview | Air date | Rating |
|---|---|---|---|---|---|
 | 01 | Former Great Detective Nagumo Keiichiro / Mashiro's Pest Extermination 2025-07-01 | Nagumo Keiichiro was once a great child detective, but age is starting to catch up with him. | 2025-07-01 | 8.0 |
 | 02 | With Ghosts, Go for the Knees / Find the Real Thief! / Three Minutes Until Mashiro Explodes 2025-07-08 | Mashiro's schoolmate seeks the agency's help in catching a ghost, and Nagumo is suspected of underwear theft. | 2025-07-08 | 8.2 |
 | 03 | Great Detective Asunaro / The Ones Who Don't Realize They're Stalkers Are the Most Dangerous 2025-07-15 | A young detective lockpicks his way into Nagumo's office and asks to work for him. | 2025-07-15 | 8.6 |
 | 04 | Murder at the Mansion of Screams / Maki-chan and the Generation Gap 2025-07-22 | Nagumo is invited to a dinner party at a stately old mansion... where a mass murder once took place. | 2025-07-22 | 7.3 |
 | 05 | Welcome to the World of Grown-Ups / A Midsummer Thriller / Mashiro and the Agent from the Stars 2025-07-29 | Nagumo takes Mashiro to his favorite bar to give her a taste of grown-up society. | 2025-07-29 | 7.3 |
 | 06 | Mashiro Hosts Girls' Night Out / Assistant Switch!! / Battle to the Death at 100° Celsius 2025-08-05 | Mashiro spends an evening with Azuha and Maki. Later, Nagumo and Asunaro switch partners. | 2025-08-05 | 7.7 |
 | 07 | Nagumo-san's Grown-Up Allure / The Lost Child and Mashiro / The Great Detective vs. Phantom Thief Riverfake 2025-08-12 | Mashiro brings back a lost little girl... and finds out there's more to her than meets the eye. | 2025-08-12 | 7.7 |
 | 08 | Nagumo's Cyber Case File / The Phantom Thief's Method / A Detective Assistant's Day Off 2025-08-19 | The gang tries to sniff out a cyber criminal who's brainwashing people through online videos. | 2025-08-19 | 7.3 |
 | 09 | Take Good Care of Your Smartphone / Maki-chan and Asunaro 2025-08-26 | Mashiro loses her smartphone, and Asunaro recounts how he and Maki became partners. | 2025-08-26 | 7.7 |
 | 10 | Catch the Sneak Photographer! / The Bullet Bride 2025-09-02 | Nagumo receives a case of someone taking indecent photos of women at a water park. | 2025-09-02 | 7.3 |
 | 11 | Mashiro and the Psychic of Love 2025-09-09 | A client asks Nagumo to save his wife from a psychic who seems to have brainwashed his village. | 2025-09-09 | 7.0 |
 | 12 | Nagumo Dons the Haori / Producing Nagumo Detective Agency / Nagumo Detective Agency Shuts Down 2025-09-16 | Can the gang make enough money to pay off Nagumo's overdue rent and save Nagumo Detective Agency? | 2025-09-16 | 7.3 |
Ratings shown are community scores. Once OMDB is wired, these become per-episode IMDB values.