Character Relationship Map: Assassination Classroom

Characters

• Koro-sensei (played by Jun Fukuyama) — protagonist

  Octopus-like teacher who destroyed the moon, tasked with teaching Class 3-E while students try to assassinate him.

• Nagisa Shiota (played by Mai Fuchigami) — protagonist

  Quiet, observant student with hidden assassination talent and exceptional emotional intelligence.

• Karma Akabane (played by Nobuhiko Okamoto) — supporting

  Alternate romanization of the brilliant, rebellious student with exceptional combat skills.

• Kaede Kayano (played by Aya Suzaki) — supporting

  Cheerful student harboring a dark secret and a personal vendetta against Koro-sensei.

• Hiromi Shiota (voice) (played by Kotono Mitsuishi) — minor

  Voice actor portrayal of Nagisa's controlling and emotionally abusive mother.

• Reaper (voice) (played by Nobunaga Shimazaki) — minor

  Voice actor portrayal of the legendary assassin and Koro-sensei's former mentor.

• Itona Horibe (voice) (played by Megumi Ogata) — minor

  Voice actor portrayal of the tentacle-enhanced transfer student seeking revenge.

• Gakushuu Asano (voice) (played by Mamoru Miyano) — minor

  Voice actor portrayal of the elite, academically perfect student council president.

• Kotaro Yanagisawa (voice) (played by Mitsuaki Madono) — minor

  Voice actor portrayal of the ambitious, manipulative student council president.

• Aguri Yukimura (played by Ayako Kawasumi) — supporting

  Former homeroom teacher whose tragic death motivates Koro-sensei's teaching mission.

• Megu Kataoka (played by Chie Matsuura) — supporting

  Calm, analytical student who serves as a reliable strategist and vice-class representative.

• Hinano Kurahashi (played by Hisako Kanemoto) — supporting

  Small, agile student who uses her size and biological knowledge for stealth and traps.

• Tadaomi Karasuma (voice) (played by Tomokazu Sugita) — cameo

  Government-affiliated PE teacher, oversees assassination training and ensures student safety during missions.

• Yuuma Isogai (voice) (played by Ryota Osaka) — cameo

  Voice actor portrayal of the responsible class representative.

• Jiritsu "Ritsu" Shikou Kotei Houdai (voice) (played by Saki Fujita) — cameo

  AI entity housed in a tablet, manages class data and assists Koro-sensei with academic and tactical planning.

• Gakuhou Asano (voice) (played by Show Hayami) — cameo

  Principal of Kunugigaoka Junior High, manipulative and ambitious, oversees Class 3-E's controversial status.

Canonical Relationships

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

• Nagisa Shiota → Hiromi Shiota (voice) (Mother and son) — Hiromi's controlling demands conflict with Nagisa's determination to remain in Class 3-E and choose his own future.

  "Hiromi pressures Nagisa to leave Class 3-E because of his grades and becomes hostile when he insists on staying. Koro-sensei impersonates Karasuma at...

• Kaede Kayano → Aguri Yukimura (Sisters) — Aguri's death drives Kaede's concealed identity and her pursuit of revenge against Koro-sensei.

  "Kaede is revealed to be Akari Yukimura, the younger sister of Aguri Yukimura, and believes Koro-sensei is responsible for Aguri's death."

• Koro-sensei → Kaede Kayano (Teacher and student) — Their teacher-student relationship is transformed by Kaede's concealed identity and her personal grievance against him.

  "Koro-sensei teaches Kaede in Class 3-E. When she attacks him with tentacles and is in danger from them, he asks the students to find a way to save he...

• Koro-sensei → Nagisa Shiota (Teacher and student) — Their teacher-student bond becomes the emotional center of Nagisa's growth and the series' farewell.

  "Koro-sensei teaches Nagisa in Class 3-E, guides his assassination skills, discusses his career choices, and gives him the final roll call before Nagi...

• Koro-sensei → Tadaomi Karasuma (voice) (Colleagues overseeing Class 3-E) — They share responsibility for the students, combining Koro-sensei's teaching with Karasuma's government and combat expertise.

  "Karasuma oversees assassination training and student safety, while Koro-sensei teaches the class. They work together during the island crisis and the...

• Koro-sensei → Karma Akabane (Teacher and student) — Koro-sensei challenges Karma's confidence while recognizing his intelligence and combat ability.

  "Koro-sensei teaches Karma after his transfer to Class 3-E, criticizes his overconfidence after the first-term exams, and continues to guide his devel...

• Koro-sensei → Jiritsu "Ritsu" Shikou Kotei Houdai (voice) (Teacher and AI student) — Koro-sensei helps Ritsu adapt from an automated weapon into a contributing member of the class.

  "Ritsu joins Class 3-E as an AI transfer student. After the class objects to her constant firing during lessons, Koro-sensei helps her become part of...

• Nagisa Shiota → Kaede Kayano (Unspoken romantic feelings) — Their close classmates' relationship carries Kaede's unspoken feelings for Nagisa and becomes entangled with the crisis around her identity.

  "Kaede hesitates to give Nagisa Valentine's chocolates, and she is ultimately unable to confess. Earlier, Nagisa kisses her to interrupt her attack an...

Story Dynamics

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

• Nagisa Shiota → Karma Akabane (Friends and classmates) — Their friendship is tested by different views of Koro-sensei's fate, but their shared history remains central to their bond.

  "They are classmates and friends; Season 2 recounts their earlier friendship and growing distance, and they fight over the choice to save or kill Koro...

• Karma Akabane → Gakushuu Asano (voice) (Academic rivals) — Their rivalry develops through academic contests that challenge Karma's confidence and Gakushuu's methods.

  "Karma loses to Gakushuu in the first-term examinations after studying too little. In Season 2, they face off over the final mathematics problem, whic...

• Koro-sensei → Gakuhou Asano (voice) (Rival educators) — They embody opposing educational approaches, with the welfare and potential of Class 3-E at the center of their conflict.

  "Gakuhou tells Koro-sensei to follow his system, which keeps Class 3-E at the bottom to motivate other students. In Season 2, Koro-sensei's teaching m...

• Koro-sensei → Reaper (voice) (Former mentor and adversary) — Their history as mentor and former student culminates in a lethal confrontation that threatens Koro-sensei and Class 3-E.

  "Season 2 identifies the Reaper as Koro-sensei's former mentor. The Reaper later joins Yanagisawa in fighting Koro-sensei and attacking the students."

• Koro-sensei → Aguri Yukimura (Close personal bond) — Aguri's kindness and their bond shape Koro-sensei's decision to become a teacher.

  "The past reveals that Koro-sensei's relationship with Aguri grew stronger during the year he was held at the facility. Aguri's death motivates his te...

• Koro-sensei → Itona Horibe (voice) (Rivals who become allies) — Their initial combat rivalry changes when Koro-sensei treats Itona as a student in need of help.

  "Itona first confronts Koro-sensei as a tentacle-enhanced transfer student and seeks to defeat him. After Shiro abandons him and his implants cause a...

• Reaper (voice) → Kotaro Yanagisawa (voice) (Partners in the final attack) — They cooperate against Koro-sensei, with Yanagisawa directing the Reaper during the final attack.

  "After his identity is revealed, Yanagisawa appears with the Reaper, and the two fight Koro-sensei. Yanagisawa directs the Reaper to attack the studen...

Story Analysis

Class 3-E's mission to assassinate its teacher becomes a year-long education in trust, responsibility, and personal growth. The story culminates in the students confronting the truth about Koro-sensei and choosing how to say goodbye.

Plot Progression

1. Season 1: A Year to Learn and Assassinate — Koro-sensei becomes Class 3-E's teacher while the students train to assassinate him. His unusual instruction gradually strengthens the class academically and personally, even as rival teachers, transf...
2. Season 1: Challenges Beyond the Classroom — The class faces conflicts on the Kyoto trip, tests of skill from new students, and an increasingly difficult island operation. Nagisa's confrontation with Takaoka demonstrates how his training can be...
3. Season 2: Bonds Under Pressure — Class 3-E continues its studies, missions, and personal growth as Itona's vulnerability and the Reaper's threat emerge. Nagisa also faces family pressure, while the students challenge the hierarchy th...
4. Season 2: The Past Changes Everything — Kaede's identity and the history behind Koro-sensei's transformation are revealed. The class must decide whether its teacher should be saved or killed, and Nagisa and Karma confront the strain in thei...
5. Season 2: Farewell and Graduation — The students seek information in space and make plans for their futures, but a government attack forces them back to the mountain. After the final battle, the class chooses to carry out the assassinat...