Mattaku Saikin no Tantei to Kitara

Mattaku Saikin no Tantei to Kitara

mangadexongoingIgarashi Masakuni

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? --- Alt. Official English: [One Peace Books](https://onepeacebooks.com/jt/Tantei.html)

RomanceComedyAdventureDramaSlice of LifeMystery
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Chapters (38)

The Phantom Thief's Method 2

2026-03-11T06:08:03+00:00

Mashiro's Locked-Room Trash Case File (End)

2026-02-27T08:38:22+00:00

Mashiro's Locked-Room Trash Case File (Start)

2026-02-21T11:04:53+00:00

Today's Mashiro is 5-7-5

2026-02-04T05:04:02+00:00

Vol. 5 Extras

2026-01-27T12:25:11+00:00

Mashiro's War Inside Her Head

2026-01-19T12:15:40+00:00

Mashiro's Stealth Mission

2026-01-17T08:27:54+00:00

A Detective Assistant's Day Off

2026-01-13T06:15:18+00:00

Detective Nagumo's Cyber Case File (End)

2026-01-12T12:09:11+00:00

Detective Nagumo's Cyber Case File (Start)

2026-01-11T16:15:21+00:00

The solid situation during Mid Summer

2025-03-25T20:20:22+00:00

Chase The Mystery of Flying Grim Reaper!!

2023-08-13T10:35:20+00:00

Where did Mashiro's pudding disappear?

2023-08-11T03:59:19+00:00

Vol. 4 Extras

2022-04-17T18:30:49+00:00

Mashiro 3 Minutes Before Explosion

2021-09-22T11:10:23+00:00

Maki-Chan and Asunaro

2021-07-10T08:43:06+00:00

Nagumo's Mature Charm

2021-07-08T13:53:18+00:00

Assistant Swap!!

2020-11-07T18:12:51+00:00

Great Detective vs. Phantom Thief River Fake

2020-05-21T17:08:32+00:00

Lost Child and Mashiro

2020-03-12T21:15:53+00:00

Mashiro Holds a Girls Talk

2020-03-04T15:49:44+00:00

A Capable Detective Talks with Their Eyes

2019-03-05T03:38:14+00:00

Mashiro and the Star Agent

2018-11-12T06:20:26+00:00

Nagumo Becomes a Parent

2018-07-08T20:26:57+00:00

Search for the Real Culprit!!

2018-05-13T21:47:36+00:00

Volume 2 Extras + Omake

2018-04-16T00:00:29+00:00

Mashiro and the Missing One Hundred Million Yen

2018-04-15T03:49:58+00:00

Welcome to the World of Adults

2018-03-18T01:47:45+00:00

Screamer Mansion Murder Case Part 002

2018-01-25T05:04:18+00:00

Screamer Mansion Murder Case

2018-01-25T04:59:51+00:00

Aim for the Knees of Ghosts

2018-01-25T04:55:15+00:00

People Who Aren't Aware They're Stalking Are the Worst

2018-01-25T04:49:44+00:00

Volume 1 Extras + Omake

2018-01-25T04:40:36+00:00

Great Detective Asunaro

2018-01-25T04:38:04+00:00

Formerly Fashionable Nagumo

2018-01-25T04:34:33+00:00

Mashiro's Vermin Extermination Case

2018-01-25T03:40:35+00:00

Ex-Great Detective's Assistant, Mashiro

2018-01-25T03:38:16+00:00

Ex-Great Detective Nagumo Keiichirou

2018-01-25T03:35:52+00:00