Longevity Martial Arts: Starting from Inner Core Skill - Chapter 1196 - 69: Struggle for the Fate of Living Beings

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

It was only last year that I realized that the world I had been reincarnated into was the world of the Romantic Comedy book. What's worse, the person I had reincarnated as was someone featured in the book.A running gag character who the Main Characters ran into at the most random times, of no use, and who would disappear as quickly as he appeared—an Extra C.Last year. A year before starting High School.It was already too late.Extra C had already become...

I lived for you in the last lifetime, everything I did was for you, yet you wanted me to die; so, this time, life is mine to live! This world lied to me, betrayed me, and humiliated me, and I am back to change everything!

- Description from Novelupdates

A cauldron, a secret forging method, and his blood created an ultimate weapon. The youngest Sword Crafting Master on Earth had been reborn from another world. With the Nine Yang Divine Furnace and a scroll of Divine Equipment, he was like a fish in water, standing at the pinnacle of the martial way. There were tens of thousands of clans, billions of cities, and countless experts. He was the master of ups and downs!