In the year 2001, alien species known as BETA (Beings of Extra Terrestrial origin which is Adversary of human race) came to invade earth. And for 20 years, they have already conquered most of the Eurasian continent, effectively decreasing the world population by billions. In response to this, the human race began to advance the development of tactical weapons (machines). Thus, elite pilots around the world start to gather at a UN base in Alaska named Yukon to participate in … read more