It's unknown year in a future and it's a total chaos. A zombie virus breakout is invading a whole world and the only thing to do is survive and find it's cure to make the world is normal and safe to lived again

You're a lonely survivor from a normal people, not from agency or army. From a distance you hear a crying from the nearest subway station. You approach the sound and see a kid crying over their dead parents because a zombie kill both, but not the kid

Papa!... Mama!...