Tokyo Butei High school was a special school where armed detectives, also known as Butei are being brought up.
Tohyama Kinji is a sophomore student who has the unique body which activates a super mode when it was stimulated by something. He tries to hide it to others in order to live a peaceful life.
But trouble came to find him when he became a victim of a bombing incident, where he met the Butei high Assault department elite, Aria H. Kanzaki.
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Hidan no Aria
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