The Regular Army of the planet Jerra has been locked in a bloody civil war with the rebellious Nexrum Army, who believe that Earth should not be involved in governing its extraterrestrial colonies. The war has left most of the planet's infrastructure in rubble and has killed countless numbers of people. In response to the Nexrum's more advanced weapons, the Jerran Army developed the Most Dangerous Soldiers, which turned out to work too well; the MDS units attacked everyone, including their allies. One such soldier, MD-02 "Geist", was ordered placed in suspended animation aboard a stasis satellite and launched into Jerra's orbit.
Geist (the main character) is MD-02, a Most Dangerous Soldier, genetically engineered to function as a killing machine, but every one of the MDS units went homicidally insane. As a result Geist was placed in suspended animation in a stasis pod orbiting the planet Jerra until it crashed several years later, awakening him and bringing him into another war on the planet.
Less than a year after Geist activated the Death Force, which decimated most of Jerra's population, he has kept himself busy by dismantling the Death Force machines one by one. Most of the remaining human population have fled to a remote haven run by a warlord named Krauser. Krauser is another MDS unit, MD-01, who has a technology that hides his mobile fortress from the Death Force.
