Muv Luv Alternative: War on Earth

Over and over again, Shirogane Takeru tried to change the fate of the world. Again and again, he failed to do so. He exhausted every option he could think of. But, when he receives an unwanted and questionable gift, together with a promise of further aid in the future, will fate finally be changed for the better? Or will darkness bear down on the universe once again? Warning AU!