Harry Potter: Ero World - Chapter 21: The Greengrass Heiress!

Born naturally defective but possessed by the spirit of a divine dragon. Inheriting the divine dragon’s will and power, growing scales and magical claws, imperial waters containing the breath of the dragon, travelling through clouds and summoning rain, an invincible physical body. In this world and era, countless men dream of slaying dragons. Li Mu Yang has always lived a hard life.

After traveling through time and space and becoming the younger brother of Uchiha Fugaku, Uchiha Yuto felt very panicked! He was preparing to practice hard to become the God of the Ninja World and suppress everyone, but after graduating from the Ninja Academy, he suddenly discovered that he had another path to take!“Itachi, don’t be a ninja; be a prodigal son! Uncle will give you money. The more you spend, the more popular you will be.”Being a ninja can't save the Uchiha! — Uchiha YutoThe more money Uchiha Yuto makes, the stronger his abilities will become!

This legend tells the tale of the protagonist, Kuroki summoned to protect the demon king from the hero.

Kuroki, unbeknownst to him, suddenly came to another world. He was summoned by the demon king, Modes. The territory which the demon king overrules was in the midst of being destroyed because of the hero. He had no choice but to bow before Kuroki.

“Please save us, Savior Dono!”

Kuroki nodded, deciding to save the demon king due to an unexpected turn of event.

“The civilians here are not simple, they are cunning, they are greedy, they are tyrannical.”

“The nobles here are not noble, they are selfish, they are arrogant, they are insidious.”

“I used to be angry about this, but now I pity them. This is a dark world. Since they were born, they have not had the opportunity to choose another life. Now it is up to me to give them.”

“I will bring food and clothing to them, and then they will have morality. I will bring comfort to them, and then they will have faith. I am a traveler from a distant world, and I will bring the fire of civilization to In this dark and wild place, I know I am doing the right thing, eradicating famine, driving out disease, suppressing crime, ending war, and giving anyone who wants a change a second chance.”

“Then, kill all those idiots who are shameless.”

- Description from novelbuddy