Xi Yan, a half-Uchiha and half-Senju, shone during the Second Shinobi World War. While on a mission to the Land of Water, he accidentally traveled to the pirate world and encountered a sea train bound for Judicial Island! Aboard this speeding train, Xi Yan encountered the boy who carried his destiny. Luffy: Are you a ninja? Xi Yan: Yes. Luffy: Be my partner! Xi Yan: Okay... Since we're here, Xi Yan, invited by Luffy, chose to join the Straw Hat Pirates and adventure with them. He used his power to help his friends rescue Robin and save the ship spirit, Merry! Merry: Xi Yan, what's that? Glancing at Moriah, Xi Yan declared that it was a waste of spirit, a waste who only knew how to rely on external things. ...During the Battle of Marineford, the massive Susanoo wreaked havoc on Marine Headquarters...

Many years later, facing the disaster that swept the world, people couldn't help but recall the day when the Rocks Pirates collapsed. At that time, everyone thought that the world would return to order, but it was not until much later that people realized that a real monster began to devour the world from that day. Roya, who traveled to the pirate world, accidentally gained the ability to transform into Qiongqi. Qiongqi is a fierce beast that accompanies natural disasters, so he can create natural disasters; Qiongqi is an evil beast that punishes good and promotes evil, so he can control man-made disasters. As a result, the world ushered in a real disaster. "Sorry, I'm not here to bring peace to the world, I only let the world use swords." Roya said. Everything started with an intern in the Rocks Pirates.