Vampire queen and a werewolf king (Highschool dxd)

Two races came together in order to survive, but when someone very special to the both of them is taken away all hell brakes lose and the three factions were slaughtered. After countless centuries of hiding form the factions they are spotted by two groups of devils and an angel. How will the Devils handle the situation before them... will they do something stupid?.. will they find it he real reason for their hatred towards them? Find out