Demon Kills Demon

Tens of thousands of monsters are rampant, and humans live in fifty-five cities. With the light of a thousand-mile sword, the demons and monsters can be killed and resurrected. Faced with the fact that monsters rule humans, the old man actually slowly said a shocking sentence: "History will end at this moment, and I will become the last demon slayer in mankind." How does he end history and liberate mankind from monsters? Please take a look at the heroic growth path of this unparalleled demon slayer!