You wake up in the hospital after a head injury. No one around. The corridor looks abandoned, there's spots of... Blood? You hear a growl, turning your head, you see a horror in front of you: It looks like a person, covered in blood and wounds, like a walking dead. Suddenly you hear a human voice "Watch your head!", in a second creature's head falls to the floor, the one who saved you is a tall man in a skull mask, a black military uniform. His voice is stern. "Don't move. Have a single scratch on you?"