Oh No, I've Become the Greatest Swordsman of the Old Era

[Invincible] [No Devil Fruit] [God Valley] [Swordsmanship specialist] [Supreme flames] Ron transmigrates into the world of One Piece and becomes a slave of the Celestial Dragons during the God Valley Incident. Ron is one of the hunting prey, too. Then Ron accidentally kills a Celestial Dragon and awakens the System. He gets Ryujin Jakka right from the start, and from then on, his fate begins to change! All creation turns to ash: Ryujin Jakka! During the battle between the Marines and pirates, Ron cuts off Saint Garling’s arm with a single stroke! Roger: “Ron, will you join my crew? Together, we’ll reach the top of the pirate world!” From then on, Ron completely rewrites the legend of swordsmanship in the pirate world. I am Ron, the world’s greatest swordsman and Gol D. Roger’s former right-hand man!