Lone: The Wanderer - Chapter 14Book 3: : Divine Empress and Hypothetical

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

As a naive teenager, he was unaware of his own superiority.Shang Xiaojie realized the violent man who had tricked him into a hotel was actually his brother-in-law.He struggled and tears streamed down his face as he pleaded, “Let me go, you idiotic beast!”“I may be foolish, but a beast? Can’t you at least admit to that?” he asked.After drugging Shang Xiaojie, he callously taunted, “You’re just a male prostitute who comes running whenever I snap my fingers. You’re nothing, Shang Xiaojie.”Devastated, Shang Xiaojie swore, “Mussaf, I hate you and I’ll make you regret this.”Upon his return five years later, he was accompanied by a young boy.Shang Mingming asked, “Is that man my father?”Shang Xiaojie responded coldly, “No, I don’t know someone like him.”Furious, Mussaf demanded, “Where are you taking my son?”Shang Xiaojie grinned and replied nonchalantly, “I’m getting married to another man. There’s nothing you can do about it.”

Pirate World, Before the Summit War.Sengoku: “In this war, the advantage is ours!”Vice Admiral Tsuru: “Can we really win?”Sengoku: “We will win.”As the Summit War begins, chaos erupts on the battlefield.Above Marineford.Suddenly, Will appears in the sky with his crew, overlooking the entire battlefield.Sengoku: “What exactly are you here for? Are you planning to help Whitebeard?”“Don’t misunderstand.”Will scans the battlefield, his gaze sweeping over the powerful figures present. A hint of excitement lingers in his tone.“I’m only here for one reason—to kill all of you. That’s it.”Sabaody Archipelago.Will watches the Celestial Dragons strutting arrogantly through the streets, their eyes filled with disdain for the world. He can’t help but frown.“These are no ordinary Celestial Dragons… This calls for a heavy punch!”...Without hesitation, he throws a devastating punch, obliterating a Celestial Dragon on the spot, crushing the surrounding Marines and CP agents with overwhelming force.The survivors turn to a trembling communications officer clutching a Den Den Mushi and scream in terror:“Hurry! Notify Marine Headquarters! Call for an Admiral!”