Tokyo Butei High school— It 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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