Provenance — where it came from
At the end of the 1990s, radio personality Hikaru Ijūin joked on air about a disease he had invented: 中二病 (chūnibyō), “second-year-of-middle-school sickness.” Its symptoms: suddenly drinking black coffee, insisting you prefer Western music, deciding adults are all corrupt — the whole theater of a fourteen-year-old performing depth.
The internet took the diagnosis and expanded the chart. By the 2000s, chūnibyō covered the more flamboyant strains: claiming a sealed power in your right arm, wearing a bandage over an uninjured eye, speaking of a dark organization only you can see. The word is not really an insult to fourteen-year-olds — everyone was one. It is aimed, gently or not, at the phase itself, and at anyone who never left it.
Anime completed the export. A popular 2012 series with chūnibyō in its title carried the word abroad, where fans adopted it untranslated as “chunibyo.” The diagnosis is now international. There is still no cure, except turning fifteen — and even that, the word warns, does not always work.
Field notes — how it’s used
俺の右腕が疼く……
ore no migiude ga uzuku……
“My right arm… it throbs…” — Stage 3 chūnibyō. The arm is fine.