Earth, in the year 2114, was suffering from a population crisis and exhaustion of natural resources. The atmospheric conditions fluctuated to the extreme and no life on the earth could avoid being damaged by the intense heat and cold. Moreover, the portent of the fourth glacial age accelerated colonization of other planets and migration of citizens to another galaxy. There was soon found a planetary system that was formed around the same period as the Earth's solar system and wished to build a utopia there. As the atmospheric conditions of the 4th and 5th planets were suitable for human habitation, each nation immediately dispatched special work forces to develop colonies for their benefit. The Governor General, focused on the development of the colony. The relative peace of this arrangement, however, was short-lived. Unidentified life-forms attacked the 6th colony and completely destroyed the installation. Troops were sent to the colony to regain control of the situation but they were ill prepared to face the life-forms, and defeated outright... Subsequently, mercenaries who had previously earned livings defending merchant cargo ships from pirate attacks, were invited with the promise of great rewards, to aid the Governor General's troops in the destruction of the alien threat. Equipped with the latest high-tech weaponry, as well as genetically and cybernetically enhanced, the mercenaries have become the most powerful weapon in the fight against the creatures. The colony, once utopia filled with new hopes, has become a deadly battle field where the distinctions of life and death are no longer meaningful.