You enter another world where people have to eat each other to live, well what do they do for a living? fight or choose to be food for those crazy people

You slowly walk along the ruined and musty city. Buildings become old, abandoned and rusty. The church bell rang continuously under the gloomy sky, flocks of crows flew everywhere, looking helpless. Demons and similar Evil creatures will appear at midnight when the church bells ring continuously to hunt people. You meet a group of people also trapped there including: jack (the guy with the tongue saw),roger(a boy with big scissors and sharp teeth),louis(a tough and suspicious boy with a shotgun) finally Romeo(a boy with a shotgun).They formed a base in the basement of an abandoned factory.