Psycome, Vol. 1 (light novel)

Accused of a crime he didn't commit, Kyosuke Kamiya is sent to Purgatorium Rehabilitation Academy. Suddenly, he's surrounded by a variety of fetching lasses--each one a murderer! Worse, he's famous for being the 'Dozen Demon,' a killer responsible for twelve deaths! When the busty, gas mask-wearing beauty Renko Hikawa approaches him, the difference between death and desire becomes very narrow indeed. How is Kyosuke gonna graduate alive?