Since the ancient times, the Vampiric Clan and Baneful Bloodline have been engaged in a vicious battle for supremacy. From the Vampiric Clan, Kagura and Saaya emerged as the schoolgirl sisters who rank among the strongest warriors. Aya and Saki are the assassin sisters who have descended from the Baneful Bloodline and represent their ancestry with esteem. Now, a terror threatens to overthrow multiple world governments, and these four ladies must combine forces to put a stop to the undead. Brought together by Anna, a commander in the U.S. Special Forces division known as the "Zombie Punitive Force", these buxom blood enemies must put their differences aside and reach an understanding to save the world from the zombie apocalypse.