At the start of the series, the Second Earth Recapture Mission from the Mars Base is sent to invade an Inbit-dominated Earth. Hopes are high, the new soldiers are freshly trained, with new weapons and a will to win back the cradle of the human race. Their efforts meet with limited success, and their strike is utterly defeated leaving only a few scattered remnants. One of these remnants is a lone soldier named Stick Bernard, a man who is out for revenge against the Inbit. Armed with only a Ride Armor, a holographic recording of his dead fiance, and a scavenger named Rey he meets along the way, he begins his battle to destroy the Inbit.