Manga Index Version 14
Under Ninja cover

Under Ninja

Author: Kengo Hanazawa
Publisher: Kodansha
Magazine: Young Magazine
Volumes: 15
Release Date: 2018-07-18
Age Rating: 15+
Copyright: © Kengo Hanazawa / Kodansha All Rights Reserved

Under Ninja Synopsis

In Under Ninja, the shadowy world of ninjas didn’t disappear after World War II—they just went underground. Secretly active across the globe, these covert operatives continue their missions into the present day. Enter Kuro Kumogakure, a low-ranking ninja with no assignments, spending his days bored and unemployed in a run-down apartment. One day, he's unexpectedly ordered to investigate Under Ninja (UN), a mysterious organization that's remained hidden for over 70 years since the war. To uncover UN’s activities, Kuro infiltrates Koudan High School disguised as a student. Now, he must balance blending into normal school life with untangling the secrets of this elusive group. A unique blend of comedy, espionage, and action, Under Ninja is a fresh twist on modern ninja tales, combining undercover antics, secret missions, and high school chaos.

Under Ninja Rating Metrics

StoryCharactersArtworkWorld BuildingThemesPacing
Story
3.8
Characters
3.8
Artwork
4.2
World Building
4.8
Themes
4.7
Pacing
4.0

Under Ninja Editorial Reviews

Ninjas Exist in the Modern World!?

Under Ninja takes place in an alternate modern reality where ninja organizations, thought to have been dismantled by GHQ after World War II, have secretly survived and continue covertly operating worldwide. The protagonist, Kuro Kumogakure, comes from a historically distinguished ninja lineage—but ironically, he's unemployed, languishing away his days in a shabby apartment as a bottom-rung ninja. One brilliant aspect of this manga is its fascinatingly believable world-building. It convincingly portrays how ninjas might realistically exist and function in today's society. While the ninjas do use futuristic weapons not possible today, these gadgets remain true to classic ninja tactics (like stealth camouflage techniques), ensuring the manga maintains a believable, immersive atmosphere. Thanks to globally popular series like Naruto, ninjas are universally familiar, making Under Ninja instantly accessible for international readers. However, be aware that unlike Naruto, this is a seinen (young adult) manga aimed at a mature audience (recommended age 16+), featuring more explicit and intense themes. Precisely because it's geared toward adults, Under Ninja can authentically explore darker themes of corruption, espionage, and realistic ninja operations. The complex, intriguing dynamic between secret organizations like UN (Under Ninja), NIN (the Ninja Association), and government agencies may seem confusing at first. But once you grasp these relationships, the manga’s thrilling depth fully unfolds, making for a highly rewarding read. Currently adapted into a Netflix anime series, Under Ninja has already earned international acclaim. Don’t miss out on this gripping modern-day ninja tale!

May 21, 2025

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