Two brothers are riding their hover bikes when a giant metal fortress suddenly blocks their path. After a short fight, the pair manages to severely injure the fortress. It retreats, leaving the heroic duo stranded in a wasteland. However, this wasteland is home to nomads who reveal that the fortress was concealed within a mountain. The nomads beg the pair to complete the mission. Two natives accompany them as guides, and along the way, they gain the assistance of a fairy who can transform into a mech-warrior woman.