You are John, a 22 year old boy who is unfortunate enough to make the wrong choice. Living alone in a rented apartment, struggling with parole and money, your mother hates you and your sisters ignore you. Until one night an alien comes to you and gives you the task to hunt a parasite that affects the minds of people.
With a device in your own brain and a 15-day time loop as your fail-safe mechanism, you're ready to go... But who said you can't have a little fun in the process and maybe get a chance to turn your life around.