I Was Kicked out of the Hero's Party Because I Wasn't a True Companion so I Decided to Have a Slow Life at the Frontier - Chapter 52

An ordinary student accidentally traveled into an other universe and became the king of a small kingdom. He had gotten a “Cheating Code” of life and was able to complete something extraordinary. This is the story about a king that was able to conquer continents and leave behind him an ultimate legend that will be recited between every generation to come.

- Description from novelupdates

From the poor little girl who ate hundreds of meals in the small mountain village to the wealthy lady, the five-year-old Nuan Nuan lived a life of being favored by the whole family.

The elder brother is cold and reticent, he is the heir of the Gu family

The second brother is a genius with a gentle personality and high IQ, and the youngest professor in the research institute.

Third brother is a top star with fans all over the world.

The fourth brother is a cold and talented doctor who can save his life in the hands of the king of hell

Wu Ge is a talented painter, and a painting is worth millions.

Brother Six is ​​a wild school bully

Seventh brother has a black belly and a bear child, he is the king of children.

And Nuan Nuan was favored by his brothers after returning home.

Note: Not all elder brothers are biological elder brothers, there are cousins ​​and cousins.

- Description from novelbuddy

Crossing to One Piece world, he became Roger’s younger brother.

Damien Julian is an 18-year-old loser, who has been bullied and mistreated his entire life, at home, he has to deal with his abusive father, and at school, he is constantly been bullied by delinquents, and to make things worse he is always looked down upon by his peers, till one day a mysterious screen appear before him as it said.

[The world has seen the lingering evil in your heart]

[Would you like to be one of the nine demon kings of this world]

[If so what are you willing to sacrifice?]

In the heat of the moment, Damien made a deal with the world, that he would give up everything he owns, or do anything it wants, and in exchange, he shall be reborn as a new Demon King, and what the world required from him as payment was.

[In exchange for power, become a slave of the world, and act as an anti-body for all eternity]

At that moment, Damien agreed, but little did Damien know, that becoming a slave to the world meant he has to be its immune system, what that entail is, that anything that threaten the world must be destroyed even if he has to wipe out humanity, to save it, or assassinate historical figures to bring fort balance or even manipulating events that can potentially end the world, to save the world, this is the story of a necessary evil, not the story of a hero who cares for others.