Devil's Son-in-Law - Chapter 830: Advancement and Crisis

A boy from 21st century Earth, met an accident and later was reborn in Naruto’s Ninja World.
He is born in Uchiha Family and becomes the useless brother of Itachi Uchiha and Sasuke Uchiha…. Let’s see how he changed the Naruto world.

- Description from Novelupdates

I’ve become the time-stop breeding uncle from an erot*c game.But the situation is completely f*cked up, so I saved the world first.Before I knew it, people around me were praising me as a hero.…..I don’t give a f*ck about being a hero, I just want to retire. f*ck.

C-class mercenary. Started as a No Class, possessing nothing.

13 years of survival in the depths of the ditches.

I’ve managed to return to the beginning, but…

An Individual from Earth finds themselves in the Shinobi World, equipped with a Scientific System. From that moment, he delved into scientific research far ahead of its time.