Two types of people that should never be put together...

Angels and Devils, exact opposites, black and white, good and bad. But is that always true? Are they always enemy's? What happens when Devil's fall for Angel's and Angel's the same. except they don't know about each others secret identities until a war comes upon them and they discover each others secrets and are forced to fight and kill or can stop this blood shedding war?

Is it possible?