This Japanese import takes place in the year 2387. Mankind has taken to the stars to escape an overcrowded Earth. Chief among its new colonies is Maris, a world which closely resembles Earth.But mankind was not the only race interested in Maris. A warlike race called the Noza launched an assault on the planet. Conventional weapons proved useless against them, and the colony feared all hope would be lost. Then three guns were discovered on Maris, made of a strange material called Zillion. When the weapons were fully charged they fired a molecular disruption beam that cut a swath through anything in its path. A special “White Knights” squad soon was trained to use these weapons to carry the fight back to the Nozian intruders.