In the first part of the game, you were a soldier of the exoplanet Sera, tasked with the responsibility of protecting the citizens from the aggressive aliens. But instead of peace, you found violence and chaos everywhere, and it is only because the hostile forces are constantly attacking your troops. In order to defend the citizens, you need to protect the exoplanet from the enemy, which means that you need to continue your fight against the alien hordes. In this part of the game, you will be taking control of the troops, and their mission is to protect the citizens from the hostile forces.