There's Something Wrong With You, My Lord! - Chapter 3: Inheritance

What if Midoriya Izuku stayed quirkless? What if he could become a hero without any powers? Or even more shocking—what if he became the successor to All For One?

An invasion like no other.
Dragons destroying everything in sight.
A new world rising from the ashes.

Blake lived through it all before he died, but now he was back, back to the time before things had ever happened.

A strange place with a strange girl....

Blake had no idea how it happened, but he suddenly had one of the enemies of mankind, a dragon girl, as his girlfriend.

--Extra Info--
Yuri tag is for his wives. Everyone in the harem will love each other.

Extra tag: NO NTR

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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.

After his family is destroyed and he is reduced to a prisoner, the young Ye Chen inherits the Sword God's legacy. With a fearless heart, he seeks vengeance for his deep-seated grudge, explores the mystery of his origins, and embarks on the path to becoming a Supreme Sword God.“Senior, please teach me the method for revenge!”“If you want to learn the method for revenge, walk up and refine the gravestone in front of this grave.If you can succeed, then you will have the method for revenge.”