In the year 20xx, scientifically created zombies roam the world in record numbers. Despite this, Aya is determined to track down her father's killer, a person who was once close to her. With sword in hand and wearing nothing but her trademark bikini and cowboy hat, she sets off to settle the score.

Sisters Aya and Saki put aside their rivalry and go toe-to-toe with Himiko and her band of zombies. The evil Himiko needs the blood of the young girls to restore her youth, while the sisters need to stop Himiko to save mankind ...