Code: Breaker Vol 1

Code:Breaker by Akimine Kamijyo. An Action manga rated Older Teen, published in English by Del Rey.

Sakura Sakurakoji watches her new classmate Rei Ogami burn people alive with blue flames, and the bodies vanish without a trace. He's a Code:Breaker, a secret assassin who punishes criminals the law can't touch, and Sakura is determined to stop him. A dark action thriller.