In this game, you will take on the role of the last commander of the fortress, which has been built as the last line of defense against the invasion of alien machines. As the invasion is coming, you are tasked with the responsibility of defending the Earth from the attacks of the aliens. To do so, you must produce and control powerful mecha to fight against the enemy.

As the invasion is coming, the world is in danger and the last remaining resources are being used to construct powerful mecha. The fate of the human race is in your hands.