Butei Aria and Kinji

Butei (武装探偵 Busou Tantei?) short for "Armed Detective", is a national qualification created to combat the worsening crime rate. The Butei are allowed to bear arms and arrest people. They'll take on any job for money, being the "jack-of-all-trades" to one another.

Other than the detective sector, even lawyers and prosecutors are obligated to obtain the arms qualification labeling them Armed Lawyer (武装弁護士 Busou Bengoushi?) and Armed Prosecuter (武装検事 Busou Kenji?)

The training facility is in Tokyo Bay for the unique purpose of training Butei, Tokyo Butei High School nicknamed "Academy Island".


Main article: Butei Law

Butei are not above the law, however. Much like police offers, the Butei follow a strict charter and operational policies in order to proceed. 


Main article: Butei Ranks

To measure a Butei's skill, they are all broken down by Ranks E to S. Typically their ranks are first acquired from studying in a Butei academy but it can improve (or errode) after graduating. 


According to Kinji, the existence of Butei can trace its roots to Sherlock Holmes himself. While he personally did not oversee the creation of the Butei nor train any students, his efforts laid the foundation for generations of Butei to come.

Despite Holmes hailing from England, it would seem that the overarching headquarters of the Butei is centered in Rome.
Butei Logo

Butei Logo

Butei School LocationsEdit

  • Tokyo Butei High School
  • Rome Butei High School
  • London Butei High School
  • New York Butei High School
  • Manchester Butei High School
  • Warsaw Butei High School
  • Washington D.C Butei High School
Hidan no Aria World