Naruto: Kurotsuchi Mayuri - Chapter 336 - 237 : Tsunade’s Troubles!!

In the Sky Sword Continent there are thousands of sects and strong cultivators as common as trees. In order to prevent his older sister from being forcefully married off, Lu Xuan had no choice to but to unceasingly cultivate and enter a sect to ask for a favor. By chance, a sword-shaped crystal of mysterious origins entered into Lu Xuan’s body, containing countless top-class martial skills, powerful martial arts, and everything you could wish for! A martial legend starts here…

- Description from Novelupdates

The character he raised was a completely useless one which couldn’t even be used to see the ending, in other words, a total failure.

Not impossible, but refused…? It was absurd for a moment.

He woke up in a strange swamp in the middle of nowhere. As the very loser he had raised. “…In the first place, I wasn’t downloading anything illegal.”

A dark era running towards destruction. A survival story of a complete loser in order to return safely.

……………………………………………………………

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Content Warning: R-18, Smut, Cruel MC[Ding! You've acquired the Heroine Stealing System!][Your first task is to steal the daughter of the Eastern Kingdom's king!][Your Fate Value has increased by 10!][You've slept with the hero's mother, your Fate Value has increased by 15!][The hero has developed animosity towards you. Current Hatred Level: 5 stars][The king's wife is charmed by your looks.]After being transported from his own world, the protagonist wakes up as Vritra, the son of Demon King Rohan from the Hell Continent.Since he's from another world, he doesn't have any Fate Value in this new world of swords and magic.To survive, he has to act like a villain, stealing the affection of every hero's heroine and sleeping with them.This will boost his Fate Value and help him stay alive in a world filled with wars and political conflicts!

A tale of an ordinary senior high school student who becomes a legend by dispensing plagues and controlling vicious virus insects.