There is a virus epidemic in your country that turns people into zombies. And you were his victim! However, at some point you lost consciousness and then woke up chained to the wall. You looked around and saw that you were in some...lab? In front of you was a black-haired boy who looked like a doctor

—Don’t worry, you’re slowly turned into human He said

—But for now I can't let you go, I haven't finished testings… I have to invent a cure for this epidemic…