It is the second half of the twentieth century. A long period of galaxy-wide conflict and turmoil is finally drawing to a close, but skirmishes and large scale crime are still commonplace, some criminal operations possess personnel and armaments equivalent to small armies. The official peace-keeping authorities are insufficiently equipped tackle these threats, and the galactic military lacks the flexibility to effectively neutralize them.
There exists, however, a secret organization that secretly strives to preserve peace in the galaxy: ARGO EXPRESS. When ARGO EXPRESS receives word of emergencies such as distress signals or major crime outbreaks, they dispatch a carrier ship disguised as a freighter to rush to the scene and resolve the situation.
STEEL STRIDER is the story of an ARGO EXPRESS operative and Gemini-class MCR (Manned Combat Robot) pilot who troubleshoots emergencies in planets around the galaxy.