[When indiscriminate killing is just to uphold justice, destruction is to protect, violence is to end evil, war is just to pursue peace, killing is just to protect more people... The boy who turned into a monster suddenly felt that the world turned out to be so simple and cute. A specific virus produced due to an accidental war was discovered again decades after being sealed. This time, it will be a disaster for the world. Infected people can only feed on humans and can never look back. Blood fills them up and meat excites them. Are they monsters? And when humans start dismembering them, the word monster is used in both directions... Both are suitable. Are humans more like monsters, or monsters more like humans? In a world without justice, how should a helpless young man struggle? Should he be reborn as a demon, or should he choose heaven? A modern battlefield full of killing is about to begin...