Chen Rui, an Otaku who came from Earth and was reincarnated as a human in another world. And then, he falls into the evil, brutal mythical world of demons called Mozu. Moreover, he must survive in the face of the horrors of demons, ferocious dragons, and many powerful enemies. Surrounded by Devil’s beauties like the black-bellied princess Lolita, the cold queen. It’s hard to live in the Devil’s world. Let’s see how a tiny Otaku uses power and strategy step by step starting to write a legend as the greatest son-in-law of the devil. The plot of this novel is similar to the Hatchet (novel).