Since ancient times, the Vampirics and the Banefuls had been locked in a vicious battle for supremacy. Eventually, the Banefuls (whose blood had evolved over time) and the Vampirics (who induced evolution by absorbing the blood of others) fell into decline, with few members surviving to carry on this eternal struggle. Among those who did survive, however, were two pairs of sisters who were being manipulated to kill one another by the diabolical Queen Carmilla of the Vampiric Clan. Although they fought as enemies, the two pairs eventually realized they were being deceived and turned their weapons toward Carmilla herself. With four against one, the evil queen fell, and the battle seemed to be over...
Yet despite defeating their common enemy, sisters Kagura and Saaya still commenced their showdown with opposing sisters Aya and Saki -- bad blood between the Vampirics and their rival Banefuls made this struggle a virtual inevitability from the start, and it seemed almost as if there were fated to be no survivors of this desperate fight. As the girls all stared into one another's eyes, however, a woman in an iron mask suddenly entered the scene, demolishing the chamber floor beneath their feet. The two pairs of sisters fell down to the underbelly of the castle, catching for one brief moment a single glimpse of the mastermind behind this attack: a woman who was sitting on Carmilla's erstwhile empty throne, flashing an absolutely audacious smile...