Character Relationship Map: Under Ninja

Characters

• Kurō Kumogakure (played by Kento Yamazaki) — protagonist

  Kurō is a young ninja trying to balance ordinary school life with his hidden duties. At school, he helps Ayaka calm down when she is overwhelmed by an exam and promises to protect her, building trust...

• Ayaka Noguchi (played by Minami Hamabe) — protagonist

  A character involved in the high school setting where Kurō infiltrates, likely a student or someone connected to the school environment, interacting with the protagonist during his mission.

• Ozu's Assistant (played by Hinami Mori) — minor
• Ozu (played by Kou Maehara) — minor
• Noheji (played by Reiya Masaki) — minor

  Noheji seeks out Kurō because he wants help tracking down a legendary underground delinquent said to live beneath the school. This request connects Kurō’s school routine to the hidden world below it;...

Canonical Relationships

Family, romantic, and professional connections based on plot evidence.

• Ozu's Assistant → Ozu (assistant)

Story Dynamics

Alliances, conflicts, and narrative interactions that evolve throughout the story.

• Noheji → Kurō Kumogakure (Social Seeker Of Help) — Noheji approaches Kurō to enlist his help in searching for the rumored delinquent beneath the school.

  Noheji seeks Kurō out, hoping he will help track down a legendary underground delinquent said to live beneath the school.

• Kurō Kumogakure → Ayaka Noguchi (Alliance Protective Supporter) — Kurō offers Ayaka personal support during her distress and promises to protect her, helping restore her trust and confidence.

  When Ayaka becomes overwhelmed during an exam, Kurō helps calm her and discreetly comforts her after she says she no longer wants to take the test. He...

Story Analysis

Kurō's attempt to navigate school life unfolds against the concealed history and infrastructure of a resurgent ninja world.

Plot Progression

1. A Hidden History Returns — The account traces how ninja organizations were driven underground after the Pacific War. Decades later, secret killings and sabotage signal their return.
2. School Life and Reassurance — Kurō tries to manage school life while carrying out hidden duties. He supports Ayaka through exam distress and promises to protect her, after which she returns to school.
3. Rumors Beneath the School — Kurō joins the class and begins interacting with students including Sato. Noheji approaches him about a legendary delinquent rumored to live beneath the school.
4. Escape into the Hidden Network — An escape route beneath a stage leads Kurō and others into an extensive underground network. A disguised radio and a warning about an attack from above heighten the danger.
5. The Factory's Costly Secret — The tunnel is revealed as part of a former secret factory tied to an Under Ninja facility. The site produced counterfeit money for UN, cost many lives, and became the focus of rapidly escalating hosti...