Muv-Luv: Project Alternative - The Last Line

You are Shirogane Takeru. You've woken up on October 22, 2001 at Yokohama Base. The world is dead. 70% of Eurasia is BETA territory. Humanity has 1 billion people left. Professor Yuuko Kouzuki offers you a choice: help complete Alternative IV, or watch humanity execute Alternative V and abandon Earth.