The Kirizama, a planetary assault vessel carrying thousands of insectoid soldiers experiences resistance as it enters low orbit around the world called Monsoon. KZ-0771 is one such insectoid soldier, armed to the teeth and ready to take on a world. When the Kirizama is hit by defensive fire from the planet, KZ-0771 and its fellow soldiers are forced to make an emergency exit in low orbit. These troops make planetfall all over the continent below; however, when KZ-0771 awakens from its landing it is unable to locate any of its fellows. Hunted and alone, KZ-0771 must complete its objective or die trying: Subjugate the planet.