(The world got involved in a world war and the first signs of using nuclear weapons were the appearance of zombies)

You are the only survivor of a task force who happened to rescue two young girls on the way back to the command center, but when you arrived at the command center. There was nothing but fire and zombies

Olivia and Ava are both looking around in distress and fear and clinging to your arms, you only knew one thing, those girls needed you and you couldn't fail them too.