Guide to Failing as a Full-Level Green Tea - Chapter 4 - This Tea is Not That Tea

"Locke transmigrated into an era where everyone had Battle Beasts. Daemons were rampant and humans were forced to build walls around their dwellings while depending on Beastmasters to keep those monsters at bay.

An Individual from Earth finds themselves in the Shinobi World, equipped with a Scientific System. From that moment, he delved into scientific research far ahead of its time.

She became the nanny of Claude, the blackened male protagonist who would destroy the world. If this continues, she will be killed by the cursed power possessed by the blackened male protagonist. So, she decided to pour out her love for the blackened male protagonist to prevent the blackening. She also raised the child’s self-esteem, and made the Duke act like a proper father, as fatherly love was essential for the male protagonist’s self-esteem. She thought the child was gradually recovering his bright face, and the Duke was now learning how to gradually give love to the child. But she doesn’t know if it’s because she worked too hard….? “It has always been a problem. You have hundreds of reasons to abandon me, but I don’t have a single one.” “Nanny will always be by my side, right? That’s why you can’t go. Never, never.” Two men started obsessing over me.

Chen Rui, an otaku from earth, is reborn into a human body in another world, who falls into the legendary evil, brutal world of the devil called Mozu where humans are treated as food. He has to survive while facing horrors of the devil, violent dragons and a variety of power enemies depending on a strange super system chip and his wits. Surrounded by Devil’s beauties such as black-bellied lolita princess, cold queens, violent dragons, charming poisonous devils …

Wanting to live in the Devil’s world is hard! Wanting to live in the Devil’s world as a human is harder! Wanting a human to be the devil’s son-in-law is hardest!

Let us see how a small otaku uses power and strategy step by step starting from an ordinary human to writing a legend as the devil’s greatest son-in-law.

- Description from Novelupdates