In the 21st century, a post-apocalyptic world is overrun by grotesque monsters and demons following a series of natural disasters. Kakugo and Harara, two siblings, were trained by their father to combat these creatures. They possess superior fighting techniques and wear special Zero armor, which contains the souls of thousands of dead warriors. Kakugo strives to bring peace and safety to humanity, but his sister Harara, equipped with a matching set of skills and armor, has a different mission: to eradicate humanity.
