The stickman president has been assassinated and the only witness who was willing to stand and testify had one condition: a trial without guards and no protection. You, as an FBI elite sniper, have to protect him in secret.
After a successful teleport, our hero ends up on the basement level of AS7 medical research facility. He finds new challenges and evidence of resistance, but still no survivors. The only ones alive are the undead.
An unknown virus plagued the planet, bringing all sorts of monstrosities, ranging from zombies to flying beasts. Enter this apocalyptic world and try to survive as long as possible.