Episodes
12 episodes · 2025
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?
E01Former Great Detective Nagumo Keiichiro / Mashiro's Pest Extermination
★8Nagumo Keiichiro was once a great child detective, but age is starting to catch up with him.
E02With Ghosts, Go for the Knees / Find the Real Thief! / Three Minutes Until Mashiro Explodes
★8.2Mashiro's schoolmate seeks the agency's help in catching a ghost, and Nagumo is suspected of underwear theft.
E03Great Detective Asunaro / The Ones Who Don't Realize They're Stalkers Are the Most Dangerous
★8.6A young detective lockpicks his way into Nagumo's office and asks to work for him.
E04Murder at the Mansion of Screams / Maki-chan and the Generation Gap
★7.3Nagumo is invited to a dinner party at a stately old mansion... where a mass murder once took place.
E05Welcome to the World of Grown-Ups / A Midsummer Thriller / Mashiro and the Agent from the Stars
★7.3Nagumo takes Mashiro to his favorite bar to give her a taste of grown-up society.
E06Mashiro Hosts Girls' Night Out / Assistant Switch!! / Battle to the Death at 100° Celsius
★7.7Mashiro spends an evening with Azuha and Maki. Later, Nagumo and Asunaro switch partners.
E07Nagumo-san's Grown-Up Allure / The Lost Child and Mashiro / The Great Detective vs. Phantom Thief Riverfake
★7.7Mashiro brings back a lost little girl... and finds out there's more to her than meets the eye.
E08Nagumo's Cyber Case File / The Phantom Thief's Method / A Detective Assistant's Day Off
★7.3The gang tries to sniff out a cyber criminal who's brainwashing people through online videos.
E09Take Good Care of Your Smartphone / Maki-chan and Asunaro
★7.7Mashiro loses her smartphone, and Asunaro recounts how he and Maki became partners.
E10Catch the Sneak Photographer! / The Bullet Bride
★7.3Nagumo receives a case of someone taking indecent photos of women at a water park.
E11Mashiro and the Psychic of Love
★7A client asks Nagumo to save his wife from a psychic who seems to have brainwashed his village.
E12Nagumo Dons the Haori / Producing Nagumo Detective Agency / Nagumo Detective Agency Shuts Down
★7.3Can the gang make enough money to pay off Nagumo's overdue rent and save Nagumo Detective Agency?