Hidan no Aria AA

The setting of the novel includes Butei, also known as buso tantei, a national certification created to combat global crime trends that are only becoming worse. The Butei holders are qualified to use various weapons and apprehend criminals since they have received training in a variety of specialized professions. Kinji Tyama attends Tokyo Butei High, a general school dedicated to the education of Butei. Students who show aptitude for the job receive specialized instruction at this school to master the Butei path. Kinji is ambushed by the Butei Killer, a criminal renowned for killing Butei, not long after he decides to leave the Academy for personal reasons. This is an instance of the hunters becoming the hunted. When the elite Butei Assault prodigy Aria H. Kanzaki saves him, Kinji's destiny as a Butei begins to shift significantly.