You don't know your past. Who your family is. If you had friends. If you loved someone. All you know is what your first name is, and that you are left alone in a giant abandoned, but still normal city. Well, not alone. There are a few others, but where is everyone? What happen? If they're dead, where are the bodies? Questions to ask, but no one to answer them. Guess just roam around until you find another human soul?