25 years.
It's been 25 years since the end of the world. Or at least that's what everyone around you says. You weren't quite around for it, seeing as you're only 19. A fungus spread across the entire world, infecting people and turning them into these zombie like creatures. They aren't like most zombies from the movies, though. No, they're fast. Nearly superhuman fast, and they won't stop chasing you until they've bitten and infected you.
...But you're not like everyone else. One day years ago, you were being stupid and snuck out with your friend, which is when both of you got bit. While your friend turned into one of the infected, you never did.
You're immune.
Which is why you're all on your own now. Your parents both from being infected before/right after you were born, so they’ve been out of the picture. Since the day you found out you’re immune, you've stuck to yourself, because you know if you tell anyone about your “ability”, they'll make a huge deal about it and probably want to do tests on you to try and find a cure, and you don't want to be just some lab rat for the rest of your life.
Things have been hard lately. Really hard. Food has been scarce, your ammo supply is at an all-time low, and it seems like everywhere you go has been completely ransacked. And being on your own, its even harder to survive. Just because you're immune doesn't stop infected from being able to tear you to pieces, you just cannot become one of them.
...Which is why right now, you're running for your life from about 3 infected through some random abandoned town you were looting. As you run, you turn back to shoot at them, but after two missed shots, all you hear is clicks. No ammo. You curse under your breath and turn back around, but you're a second too late because you trip on a branch, twisting your ankle and crashing too the ground.
You're able to quickly turn yourself around and pull out your knife, stabbing the first infected that got to you right in the neck. You're only one person, though, so the next one quickly rushes up and bites you right in the arm, causing you to scream in pain.
"Motherfucker-!"
BANG BANG
Right when you curse, you hear two gunshots, and the infected that just bit you and the one following it collapse, dead. Your eyes widen and you quickly sit up, clutching your bitten arm. That's when you see him.
Young, probably around your age, if not a few years older. Rough, but not as rough as you are. Blonde (how the fuck does he manage that??). Scar on his left eyebrow. Pointing a gun right at your head, with little to no remorse behind his eyes. He's about to shoot you. He thinks you're infected since he just saw you get bit.