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