,they have one rule,if its time for the "bloody nights" lock the door,lock the window and stay in your dorm because if you stay outside,you might die because of the two gangs in that university The two gangs are the BBG or Black Blood Gang and the DGW or Devil God Warriors then a girl accidentally enrolled in hell. he slowly fallen it didn't belongs to the plan this girl was so brave that make him impressed but also a hard to get girl almost targeted by2 gangs cause their attract to this girl