LULACLOUD

Manga Series

Mattaku Saikin no Tantei to Kitara

Romance Comedy Drama Adventure Slice of Life Mystery

Synopsis

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)

📑 Chapters (38)

Read Latest
34

Chapter 34 — The Phantom Thief's Method 2

Mar 11, 2026

33

Chapter 33 — Mashiro's Locked-Room Trash Case File (End)

Feb 27, 2026

32

Chapter 32 — Mashiro's Locked-Room Trash Case File (Start)

Feb 21, 2026

31

Chapter 31 — Today's Mashiro is 5-7-5

Feb 04, 2026

30.5

Chapter 30.5 — Vol. 5 Extras

Jan 27, 2026

30

Chapter 30 — Mashiro's War Inside Her Head

Jan 19, 2026

29

Chapter 29 — Mashiro's Stealth Mission

Jan 17, 2026

28

Chapter 28 — A Detective Assistant's Day Off

Jan 13, 2026

27

Chapter 27 — Detective Nagumo's Cyber Case File (End)

Jan 12, 2026

26

Chapter 26 — Detective Nagumo's Cyber Case File (Start)

Jan 11, 2026

25

Chapter 25 — The solid situation during Mid Summer

Mar 25, 2025

24

Chapter 24 — Chase The Mystery of Flying Grim Reaper!!

Aug 13, 2023

23

Chapter 23 — Where did Mashiro's pudding disappear?

Aug 11, 2023

22.5

Chapter 22.5 — Vol. 4 Extras

Apr 17, 2022

22

Chapter 22 — Mashiro 3 Minutes Before Explosion

Sep 22, 2021

21

Chapter 21 — Maki-Chan and Asunaro

Jul 10, 2021

20

Chapter 20 — Nagumo's Mature Charm

Jul 08, 2021

19

Chapter 19 — Chapter 19

Oct 15, 2020

18

Chapter 18 — Great Detective vs. Phantom Thief River Fake

May 21, 2020

17

Chapter 17 — Lost Child and Mashiro

Mar 12, 2020

16

Chapter 16 — Mashiro Holds a Girls Talk

Mar 04, 2020

15

Chapter 15 — A Capable Detective Talks with Their Eyes

Mar 05, 2019

14

Chapter 14 — Mashiro and the Star Agent

Nov 12, 2018

13

Chapter 13 — Nagumo Becomes a Parent

Jul 08, 2018

12

Chapter 12 — Search for the Real Culprit!!

May 13, 2018

11.5

Chapter 11.5 — Volume 2 Extras + Omake

Apr 16, 2018

11

Chapter 11 — Mashiro and the Missing One Hundred Million Yen

Apr 15, 2018

10

Chapter 10 — Welcome to the World of Adults

Mar 18, 2018

9

Chapter 9 — Screamer Mansion Murder Case Part 002

Jan 25, 2018

8

Chapter 8 — Screamer Mansion Murder Case

Jan 25, 2018

7

Chapter 7 — Aim for the Knees of Ghosts

Jan 25, 2018

6

Chapter 6 — People Who Aren't Aware They're Stalking Are the Worst

Jan 25, 2018

5.5

Chapter 5.5 — Volume 1 Extras + Omake

Jan 25, 2018

5

Chapter 5 — Great Detective Asunaro

Jan 25, 2018

4

Chapter 4 — Formerly Fashionable Nagumo

Jan 25, 2018

3

Chapter 3 — Mashiro's Vermin Extermination Case

Jan 25, 2018

2

Chapter 2 — Ex-Great Detective's Assistant, Mashiro

Jan 25, 2018

1

Chapter 1 — Ex-Great Detective Nagumo Keiichirou

Jan 25, 2018

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