Kengo Hanazawa Reveals the Unexpected Origins and Silent World-Building Secrets of *Under Ninja*

Kengo Hanazawa, the visionary recognized globally for the critically acclaimed horror series I Am a Hero, recently captivated audiences by discussing his latest hit, Under Ninja. Speaking at Anime NYC 2025, Hanazawa provided an exhaustive look into the intricate creative mechanics driving the series, which masterfully blends traditional ninja lore with the mundane realities of modern Japan. This approach defies conventional genre expectations prevalent in seinen manga and anime.

Under Ninja immerses readers in a contemporary world where specialized ninja organizations operate discreetly within the shadows of Japanese society. The central figure is Kuro Kumogakure, a protagonist who initially appears to be nothing more than a listless NEET, but is soon thrust into a highly volatile assignment.

Hanazawa confessed that the genesis of this complex narrative was surprisingly simple: a casual suggestion from his editor asking, "Oh, what about ninjas?" This unassuming starting point catalyzed the development of a story far deeper and more psychological than a standard martial arts epic.

Crucially, Hanazawa chose to subvert expectations by creating a main character who actively resists heroic action. This narrative choice necessitated the reliance on an exceptionally diverse and dynamic ensemble cast to propel the multifaceted plot forward.

Stylistic Choices and Narrative Depth

A distinguishing stylistic element of the manga is Hanazawa's deliberate restraint in the use of sound effects. By minimizing onomatopoeia, he achieves a unique, almost tranquil ambiance that perfectly mirrors the silent, stealth-based nature of the ninja profession. This is a stark contrast to the often deafening visual language of many shonen titles.

This slow-burn, character-centric approach allows Under Ninja to delve into profound themes of personal ambition, hidden identity, and the quiet struggles of everyday individuals navigating extraordinary circumstances.

Serialized successfully in Kodansha’s Weekly Young Magazine since 2018, the momentum of Under Ninja has not slowed. Its popularity has resulted in both a well-received anime adaptation produced by Tezuka Productions and an eagerly anticipated live-action film project, dramatically increasing its global visibility.

Hanazawa’s unparalleled skill in balancing elaborate, interwoven storylines with a distinctively quirky yet realistic artistic aesthetic continues to secure Under Ninja's position as a truly unique and influential property in the current landscape of manga and anime.