Festival of Lights · Diwali
Xi Yan joined the Straw Hat Pirates’ assault on Judicial Island and helped them reach Nico Robin, who finally chose to live and return to sea with the crew. With the Buster Call activated and Robin’s handcuffs still locked, the Straw Hats split up to fight CP9 for the keys.
Xi Yan stopped the Buster Call, fought the Navy’s Vice Admirals, and escaped with the Straw Hat Pirates after Luffy defeated Lucci. He joined the crew, saved Merry by sealing her in a scroll and restoring her vitality, while the Navy turned its attention to capturing the Straw Hats and Blackbeard’s capture of Ace.
The Straw Hat Pirates left Water Seven with Franky and Usopp, then faced the Achino Family after being drawn into the Ice Sea. They reached the family’s stronghold with the Phoenix Pirates, where Aqi Nuo revealed Zoro was imprisoned and Xi Yan offered to show Luffy ninjutsu.
The Straw Hats reached Thriller Bark, where Xi Yan battled Moria’s forces while the crew learned how Moria stole shadows to create zombies. After Moria stole several crew members’ shadows and put Luffy’s shadow in Oars, the group prepared to reclaim them and help Brook fight Ryuma.
Xi Yan and the Straw Hat Pirates defeated Moria, escaped Kuma, and welcomed Brook into the crew before setting out for Fish-Man Island. After rescuing Hatchan from Duval, they learned they needed to coat the Thousand Sunny at Sabaody Archipelago.
The Straw Hats reached Sabaody, where Xi Yan learned Haki, faced Big Mom’s marriage offer, and helped rescue Camie and Merry from human traffickers. After Xi Yan and Luffy killed the Celestial Dragons who threatened their friends, the crew fled through an island under Marine assault and defeated a Pacifista, while Kizaru continued closing in.
After Kuma scattered the Straw Hat Pirates, Xi Yan and Luffy reached Amazon Lily, where Xi Yan secured Hancock’s help and a route toward Ace. Hancock joined the war after Xi Yan removed her slave mark, while Whitebeard’s forces began moving against the Navy.
Xi Yan and Luffy infiltrated Impel Down to rescue Ace, with Xi Yan holding off Magellan while Luffy was poisoned and taken for treatment. The arc ended with Xi Yan and Ivankov preparing to investigate Ace’s disappearance as Borsalino carried Ace toward Navy Headquarters.
Xi Yan and Luffy broke out of Impel Down with Ivankov, Jinbe, Crocodile, and the other prisoners, then raced toward Navy Headquarters to rescue Ace. As Whitebeard’s forces arrived, Xi Yan guided the escapees through a tsunami and the battle at Marineford began.
Xi Yan joined the battle at Marine Headquarters, using his abilities to help Luffy and the Whitebeard Pirates while the Marines tried to contain them. Whitebeard recovered enough to fight Akainu, while Luffy continued toward Ace and the battle remained unresolved.
Xi Yan helped Luffy and Ace escape the execution, then stayed behind to protect the retreating pirates as Whitebeard fought and died at Marineford. Blackbeard tried to claim Whitebeard’s power, but Shanks arrived and declared that he had come to end the war.
After the war, Xi Yan reunited with Hancock and helped Luffy decide to train for two years before setting out alone to attack Mary Geoise. He freed slaves, killed Celestial Dragons, and sent evidence of the revolt to Morgans, leaving the World Government preparing to hunt him.
Xi Yan attacked Mary Geoise to free slaves, fought the God's Knights, and escaped by faking his death. After returning to Sabaody and recovering his stolen treasure, he reunited with Hancock and the others on Amazon Lily.
Xi Yan reunited with the Straw Hats after training on Rusukaina, shared news of the wider world, and helped the crew regroup on Sabaody. After defeating the Marines and Pacifistas, the Straw Hats escaped aboard the Thousand Sunny, where Merry's wind powers and Sanji's unexpected reunion with the okama left them poised to depart.
The Straw Hat Pirates reached Fish-Man Island, where a prophecy and false accusations set them against Ryugu Kingdom while Vander Decken targeted Shirahoshi. Jinbe recounted the island’s history and confessed his role in Arlong’s release, leaving him kneeling before Nami as Hody’s planned attack loomed.
The Straw Hat Pirates and Xi Yan defeated Hody’s forces, saved Fish-Man Island from Noah’s Ark, and helped Shirahoshi and Neptune restore order. After learning more about the New World and Joy Boy, Luffy challenged Big Mom to protect the island.
The Straw Hat Pirates entered the New World, rescued Panz Fry, and followed a distress call to Punk Hazard, where they fought the island’s strange inhabitants and searched for their captured crewmates. They reunited amid the children’s escape and discovered that Law had swapped several crew members’ souls between bodies, while Kin'emon continued searching for his son, Momonosuke.
The Straw Hats uncovered Caesar Clown’s experiments on children and fought to escape Punk Hazard as he unleashed his island-destroying weapon. Law formed an alliance with Luffy against Kaido, and the rescued prisoners began confronting Caesar while Xi Yan’s group rushed toward the laboratory to save Momonosuke.
Xi Yan and the Straw Hat Pirates fought Caesar and Vergo while rescuing the children and helping the G5 Marines. After Luffy defeated Caesar and Law defeated Vergo, the group escaped Punk Hazard’s destruction and began arranging care for the children.
The Straw Hat Pirates helped Law rescue the children from Punk Hazard, then joined his plan to bring down Doflamingo’s SMILE operation in Dressrosa. After Doflamingo resigned from the Shichibukai to recover Caesar, the alliance prepared to exchange him near Green Bit.