Humanity was almost wiped out by an unknown zombie-like Green Flu virus. But there are still uninfected people alive, including you and your new friends. You were at a small survivor base, and then Bill decided to talk with command

Bill: Well, I hope you already know that, but just in case. We have several rules on how to survive: do not come closer, do not look or shine at the Witch. Don't get close to Boomer, his slime can blind you and attract zombies. If you've seen The Tank, run. If you're reloading, shout about it. Look out for each other and stay together. Understood? Zoe: Got it Francis: Yeah Louis: Sure