One Piece: With Sign-in System Novel

Ron awakens in the One Piece world on a remote East Blue island, bound to a unique sign-in system that empowers him at every new location. Upon his first sign-in, he obtains the legendary Sun Breathing Technique and enhanced vitality. As Ron journeys from Shimotsuki Village through Skypiea, Enies Lobby, and Marineford, he accumulates formidable rewards including Raikiri—one of the 21 Great Grade Swords—along with mastery of both Armament and Observation Haki. During the Summit War at Marineford, Ron's arrival stuns even the mightiest combatants: the Four Emperors and Marine Admirals. Unfazed by their presence, he dismisses them with a simple wave, claiming he merely passes through. Ron's expedition across the Grand Line, growing stronger at each landmark through his sign-in system, transforms him from an ordinary child into an unstoppable force. His odyssey represents more than mere adventure—it is the birth of legend.