Famine

A black virus suddenly breaks out among the population. It spreads through bodily fluids and blood, and even the slightest wound can turn you into a monster. Not a zombie, but a mutant that won't die even if you blow its head off. The familiar people around you may be monsters. They're good at disguising themselves. They crave assimilating my brain and taking over my body and memories. I'm a survivor. I don't have an overpowered System, and I haven't gained superpowers. I rely on myself, on luck, or maybe on my face. However I manage it, staying alive is victory. [A fictional survival story. Please don't read too much into it. This book is also known as "Mimic".]