Martial Arts Slaying Demons

The gate of the abyss is wide open, the demons have descended, all life is in ruins, and the people are in dire straits. This is an era of tears and blood. Countless pioneers of the human race have sacrificed their lives heroically, using their own little strength to fight for a glimmer of hope for the human race. Will humans become slaves and food of the demons? I don't think so, because humans would rather die than surrender and never be slaves!