The main campaign involves the story of how in the 21st century mankind has colonized the moon. In 2089, an invading Xenon empire destroys several lunar outposts. The base Nectaris, the largest of the lunar outposts wasn't fully destroyed and a few units escaped alive and now are planning a counter attack on the Xenon empire. Now it's up to the player who is put into the role as the Union forces commander to defeat the enemy Xenon forces.