I Loaded the Demon Manual

Hidden in this steam are men and horses with sheep heads, bird-footed women with wings on their backs, and broken swords that devour humans... There are no gods, no heroes, no gifts, just pure demons and curses. In order to survive, Duran, who traveled through time, had no choice but to pick up the devil's illustrated book. He only needed to study and understand the devil to extract the corresponding abilities of the devil. In this unknown mystery, how can we get a glimpse of the secrets of the world...