MTL - Business Manager - Chapter 1 I dare you to be king

Xia Yan passed through to the world of Bleach and became an eleven-year-old boy. He was rescued by Renji and Rukia in the Seireitei, and he was studying at Shin’ō Academy, and he was a student of the same class.
He is a top student of the Shin’ō Academy, and he is vying for strength by various teams. In the end, he has entered the first team of secret mobile maneuvers.
He will use punishment to kill every person who tries to threaten the martyrdom and protect his loved one.

- Description from Novelupdates

The once greatest Saint underneath the heavens has been reborn after one hundred years. He cultivates with mighty skills, and he fights to once again reach the top of the world!

Don’t compete with me when it comes to concocting pills, 100% effectiveness means nothing to me.

Don’t compete with me when it comes to cultivation speed, I won’t be responsible when you die from embarrassment.

Don’t compete with me when it comes to experience, as I’m an ancient ancestor.

The existence of Jiang Chen is destined to ridicule thousands of geniuses…

She is one the most famous thieves of the twenty-first century and the legendary racing queen who is unrivalled in the underworld.

She is a carefree girl who comes and goes as she pleases like the wind.

He is a powerful underworld boss, known to be cruel and merciless.

***

He didn’t think that someone would dare to provoke him by touching what belonged to him. Since they had shown him enmity, then he would return it in her stead.

Passion. Love. Hate. Pain.

It was all impossible to unravel.

- Description from Novelupdates

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.