I Betrayed Magic and Became a Demon Hunter

Magic is hidden, disasters occur, and demons descend. Along with the destruction of a city, the guardians hidden in modern society appear in the eyes of ordinary people together with the strange and terrifying demons. Lu Chen, who has no magic talent, thought he could continue to live an ordinary life, but one day he learned that his sister had become an infected person. "The precious panacea cannot be used on an ordinary person." They said this with no emotion in their eyes. Although they have the same appearance as humans, they cannot be called humans. Desperate Lu Chen prayed to God, and what answered him was the culprit of the tragedy - the king-level demon named "Prayer". "Sign a contract with me at the cost of [soul], and I will fulfill all your wishes." At this point, a demon hunter reaches the culmination of all weirdness and mystery.