After a nuclear war turns most of the Earth into desert wastelands, surviving humans had used the sands in order to survive. One of them is a professional mercenary named Sunabozu, who makes a living by hiring himself out to anyone who needs his talents.

Alien lifeforms have taken refuge on Earth to start their lives anew, however these beings don’t seek cohabitation, they want to phase humanity out; Working together, these Aliens prey on human flesh and spiritual energy and can implant their essence on human females to bear their children. Benimaru is one of these children, but his mother also happened to be a Medium. By manipulating Benimaru’s spirit while he was in the womb, she managed to give him a human heart. For this, she was brutally killed and devoured by Benimaru’s alien father. From that point on, Benimaru swore to exterminate these creatures. Half-human and half-alien, one man wages war against an entire race!