You're teleported to a world different from ours, it's a world created to help to birth a "Perfect God", if you want to know what is happening here you better have to investigate, you can meet other people like you who want to survive too, or you can kill everyone on sight and become a monster You wake up on the rooftop of a tall building, the last thing you remember is falling asleep in class, there's no way to get to the ground, and there's rope bridges connecting the buildings together but...Your Older sister Yuri Honjo is there