Ryuya finds himself trapped within Doflamingo's birdcage in the One Piece world, but fortune strikes when he awakens a sign-in system granting him Ryujin Jakka—the most formidable fire-type Zanpakutō in existence. Chanting "Everything turns to ashes; Ryujin Jakka!" he unleashes devastation that spreads his legend across the seas through unparalleled destructive power. The Five Elders grow increasingly frustrated: "Who constantly interferes with our plans?!" Sengoku suspects darker motivations: "This man definitely conceals something sinister." Akainu realizes his vulnerability: "His flames pierce through my defenses?!" Red Hair sees potential alliance: "I must recruit this formidable individual!" Each island visited through his sign-in system bestows extraordinary rewards, cementing his position as the ocean's supreme force. Known by the alias White Dove, Ryuya dominates every challenge through a combination of the Pirate Travel System and his overwhelming fire-based abilities in this two-dimensional realm.