Earth is undergoing the umpteenth alien invasion so far in the 21st century. All the armies of the defending forces have declared a strike of fallen arms due to overwork, so only YOU can avoid the catastrophe ...

But, helpless in the face of the attack, you see how the invading ships destroy your hometown. And the only ship you have to fight back is in an almost inaccessible place.

In order to reach the ship, you must obtain the lifting force found in the mutation cabins at the end of intricate mazes full of beasts and monsters.