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!
1 season · 12 episodes
S1 E1Former Great Detective Nagumo Keiichiro / Mashiro's Pest Extermination
Jul 1, 20258
Nagumo Keiichiro was once a great child detective, but age is starting to catch up with him.
S1 E2With Ghosts, Go for the Knees / Find the Real Thief! / Three Minutes Until Mashiro Explodes
Jul 8, 20258.224 min
Mashiro's schoolmate seeks the agency's help in catching a ghost, and Nagumo is suspected of underwear theft.
S1 E3Great Detective Asunaro / The Ones Who Don't Realize They're Stalkers Are the Most Dangerous
Jul 15, 20258.624 min
A young detective lockpicks his way into Nagumo's office and asks to work for him.
S1 E4Murder at the Mansion of Screams / Maki-chan and the Generation Gap
Jul 22, 202524 min
Nagumo is invited to a dinner party at a stately old mansion... where a mass murder once took place.
S1 E5Welcome to the World of Grown-Ups / A Midsummer Thriller / Mashiro and the Agent from the Stars
Jul 29, 202524 min
Nagumo takes Mashiro to his favorite bar to give her a taste of grown-up society.
S1 E6Mashiro Hosts Girls' Night Out / Assistant Switch!! / Battle to the Death at 100° Celsius
Aug 5, 202524 min
Mashiro spends an evening with Azuha and Maki. Later, Nagumo and Asunaro switch partners.
Junichi Suwabe
Keiichiro Nagumo (voice)
Kana Hanazawa
Mashiro (voice)
Kengo Kawanishi
Taro Nezu (voice)
Tomokazu Sugita
Cheerful Old Man / Nipple-Tasting Man / Cross Chest Hair Man / Man Who Likes Ropes (voice)
Saya Horigome
High School Girl on TV (voice)
Shoumaru Zouza
News Announcer (voice)
Chado Horii
Cerberus (voice)
Haruna Mikawa
Cafe Staff (voice)
Kozue Saito
Granny (voice)
Amane Shindo
Mako Hachiya (voice)
Taichi Takeda
Skin (voice)
Taisuke Nakano
Intellectual (voice)
