A new BETA threat arises, but humanity remains fractured. Can they set aside their conflicts and unite before it's too late? 

◇ ‘What is “Muv-Luv Unlimited: The Day After”?’
A spin-off title of the Muv-Luv series, continuing from “Muv-Luv” and “Muv-Luv Alternative”.
The fourth title in a spin-off series derived from “Muv-Luv Unlimited”, which branches into a different future from the anime-adapted “Muv-Luv Alternative.”
After protagonist Shirogane Takeru sees the heroine escape Earth in “Muv-Luv Unlimited”, this story portrays the people left behind on Earth who nonetheless keep battling against their fate of extinction.

◇ Story
The war between Japan, the United States, Canada, and France—sparked by the food crisis—temporarily subsided, but the core issue remained unresolved.
A devastated Earth, the looming threat of the BETA, the power struggles between nations, and the everyday people caught in the middle.
What path will Hibiki, now a hero of the Empire, choose?