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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!

July 1, 2025
Nagumo Keiichiro was once a great child detective, but age is starting to catch up with him.

July 8, 2025 • 24m
Mashiro's schoolmate seeks the agency's help in catching a ghost, and Nagumo is suspected of underwear theft.

July 15, 2025 • 24m
A young detective lockpicks his way into Nagumo's office and asks to work for him.

July 22, 2025 • 24m
Nagumo is invited to a dinner party at a stately old mansion... where a mass murder once took place.

July 29, 2025 • 24m
Nagumo takes Mashiro to his favorite bar to give her a taste of grown-up society.

August 5, 2025 • 24m
Mashiro spends an evening with Azuha and Maki. Later, Nagumo and Asunaro switch partners.

August 12, 2025 • 24m
Mashiro brings back a lost little girl... and finds out there's more to her than meets the eye.

August 19, 2025 • 24m
The gang tries to sniff out a cyber criminal who's brainwashing people through online videos.

August 26, 2025 • 24m
Mashiro loses her smartphone, and Asunaro recounts how he and Maki became partners.

September 2, 2025 • 24m
Nagumo receives a case of someone taking indecent photos of women at a water park.

September 9, 2025 • 24m
A client asks Nagumo to save his wife from a psychic who seems to have brainwashed his village.

September 16, 2025 • 24m
Can the gang make enough money to pay off Nagumo's overdue rent and save Nagumo Detective Agency?