Kimetsu no Yaiba: Katanakaji no Sato-hen

In the continent of Longmai, thousands of clans stand tall, countless sects exist, and cultivation is the way of life. The strong can do anything they want while the weaklings live like ants. Youngster Chen Feng has an incomplete dan region, causing him to be unable to cultivate, he withstood countless sneers directed at him. Until he obtained a mysterious dragon bloodline, breaking out of his cocoon and opening a new chapter to his life! Coquettish demonic fox spirits, cold female emperors, demon girls or princesses from a prestigious clan, all of them jump into my embrace. With the unparalleled inheritance, I will manifest the strongest martial spirit, obtain all the beauties and look down from the heavens. (Source: AC.QQ, translated)

The protagonist Qin Chen, who was originally the top genius in the military domain, was conspired by the people to fall into the death canyon in the forbidden land of the mainland. Qin Chen, who was inevitably dead, unexpectedly triggered the power of the mysterious ancient sword. Three hundred years later, in a remote part of the Tianwu mainland, a boy of the same name accidentally inherited Qin Chen’s will. As the beloved grandson of King Dingwu of the Daqi National Army, due to the birth father’s birth, the mother and son were treated coldly in Dingwu’s palace and lived together. In order to rewrite the myth of the strong man in hope of the sun, and to protect everything he loves, Qin Chen resolutely took up the responsibility of maintaining the five kingdoms of the world and set foot on the road of martial arts again.

Gol D. Roger was known as the "Pirate King," the strongest and most infamous being to have sailed the Grand Line. The capture and execution of Roger by the World Government brought a change throughout the world. His last words before his death revealed the existence of the greatest treasure in the world, One Piece. It was this revelation that brought about the Grand Age of Pirates, men who dreamed of finding One Piece—which promises an unlimited amount of riches and fame—and quite possibly the pinnacle of glory and the title of the Pirate King. Enter Monkey D. Luffy, a 17-year-old boy who defies your standard definition of a pirate. Rather than the popular persona of a wicked, hardened, toothless pirate ransacking villages for fun, Luffy's reason for being a pirate is one of pure wonder: the thought of an exciting adventure that leads him to intriguing people and ultimately, the promised treasure. Following in the footsteps of his childhood hero, Luffy and his crew travel across the Grand Line, experiencing crazy adventures, unveiling dark mysteries and battling strong enemies, all in order to reach the most coveted of all fortunes—One Piece. [Written by MAL Rewrite]