Kinji Hakari was suspended from Tokyo Jujutsu High because he beat up a conservative higher-up in the jujutsu hierarchy after a disagreement, leading the authorities to sideline him from official school activities.

Core reason for Hakari’s suspension

  • In the official fanbook and story materials, it is stated that Hakari clashed with a conservative member of the jujutsu higher‑ups and physically assaulted them.
  • This incident violated the strict internal rules of Jujutsu High, resulting in his suspension and exclusion from events like the Kyoto Goodwill Event.

How it fits Jujutsu Kaisen’s themes

  • Hakari is portrayed as a rebel who rejects rigid, conservative jujutsu norms, so his suspension highlights the tension between free‑spirited sorcerers and the old guard running jujutsu society.
  • Later material emphasizes that he wasn’t suspended for random cruelty, but for fighting against the conservative faction’s ideas, which makes him more of an anti‑establishment figure than a straightforward delinquent.

Extra context fans often discuss

  • During his suspension, he is associated with running or being involved in underground gambling-style fight clubs, reinforcing his outsider status and rule‑breaking image.
  • Fans frequently connect his wild, gamble-like fighting style and personality with this backstory, seeing the suspension as a narrative way to show how dangerous and uncontainable he seems to the establishment.

TL;DR: Hakari was suspended because he assaulted a conservative higher‑up in Jujutsu society after a dispute over their rigid views, marking him as a rebellious sorcerer at odds with the establishment.

Information gathered from public forums or data available on the internet and portrayed here.