Isaac manages to overpower Luffy with his mechanical enhancements, including a gauntlet over his arm that can fly and be controlled remotely as well as rocket jets allowing him to fly. Zoro and Sanji then leap off the Sky Prison and fall down to Jail Island, but Luffy stays behind to confront Isaac.
Zoro and Sanji, who are in disguise as Marine guards on the pavilion, proceed to drop their charade and take down the Marines guarding Luffy as Robin sprouts an arm to unlock Luffy's handcuffs. As Nami hurriedly informs the others, Usopp, Franky, and Trafalgar Law are keeping watch over the Thousand Sunny and are suddenly forced to defend it from an assault by robot warriors. However, upon opening it they are met with a shock, as nothing is in the safe and their mission was a trap. As Robin and Chopper ambush the guardroom to seize the key to Luffy's Seastone handcuffs, Nami and Brook infiltrate the prison and open the safe they believe the treasure to be in. However, Luffy had gotten captured intentionally as part of the plot by the Straw Hat Pirates to find a treasure they had heard about in the Sky Prison. The guards take him to an outdoor pavilion, where the warden Isaac greets him and welcomes him to Jail Island. The story begins with Luffy being led through a corridor by Marine guards in the "Sky Prison" high up in the air. Story World Seeker Prologue: "To Sogyoku Town!" Techniques from the anime like Gum Gum Rocket which allows Luffy to easily traverse the world and Gum Gum Bazooka are also featured in the game. Among other elements, the combat features stealth elements and Luffy can use the Kenbunshoku Haki to see enemies from behind walls. It is set in Prison Island, and the player can experience and wage battles in an open world environment which can be freely explored. World Seeker puts players in the role of Luffy from a third-person perspective.