Nico Robin is abducted by CP9, who are seeking her knowledge about the ancient weapon, Pluton. This prompts the Straw Hats to launch a rescue mission, facing off against powerful CP9 agents in intense battles. The arc explores themes of loyalty, friendship, and sacrifice, particularly highlighting Robin’s struggles with her past.

The climax culminates in a showdown at Enies Lobby, where the crew fights to save Robin and confront the government forces. After a hard-fought victory, they rescue Robin, and Franky decides to join the Straw Hats as their new shipwright. The arc concludes with the unveiling of the Thousand Sunny, their new ship, marking a new chapter in their journey.