Water 7 & Enies Lobby Saga

The crew arrives at Water 7, a shipwright hub, seeking repairs for the deteriorating Going Merry. They discover the treacherous CP9 (Cipher Pol 9), a secret government agency hunting Robin for her knowledge. Robin is captured, forcing a desperate assault on Enies Lobby. The crew rescues Robin, but the Going Merry is destroyed. The Thousand Sunny, their new ship, represents the crew's continued growth.

The Water 7 and Enies Lobby Saga marks a critical transformation in One Piece's narrative scope and emotional weight. The arc introduces the World Government's hidden mechanisms of control and begins revealing why the global system functions as it does. CP9, a secret government assassination and enforcement agency, operates with complete secrecy and authority to execute without trial. Their existence contradicts the benevolent appearance the World Government presents publicly. Iceburg, president of the Galley-La Company — the world's preeminent shipwright guild — and the mayor of Water 7 himself, becomes the arc's central civilian figure. A former apprentice of the legendary Tom (who built Gol D. Roger's ship Oro Jackson), Iceburg secretly holds the blueprints for the ancient weapon Pluton. CP9's mission is to acquire those blueprints and eliminate him. His attempted assassination, staged to frame the Straw Hats, is what fractures the crew's standing in Water 7 and forces their hand. Iceburg's survival and decision to expose the truth about Robin is what finally reunites the crew and triggers the Enies Lobby assault. Robin's past emerges as the arc's emotional center. As a child, Robin survived the destruction of Ohara, an island of scholars studying forbidden history. CP9 destroyed her entire world because the scholars were researching the Void Century — history the World Government violently suppresses. When CP9 discovers her location, she sacrifices herself to protect the crew, allowing capture to draw them away from the Straw Hats. Luffy's response demonstrates the fundamental nature of his character: he absolutely refuses to abandon crew, regardless of danger. Rather than accepting Robin's sacrifice, he organizes a full-scale assault on Enies Lobby, the World Government's judicial island. This decision makes the Straw Hats enemies of the World Government directly — no longer simple pirates, but rebels actively opposing the system itself. The climax involves Luffy's battle with Rob Lucci, CP9's strongest member, who possesses a Zoan-type Devil Fruit combined with elite martial arts training. The battle pushes Luffy to his limits, introducing Gear Second — a technique amplifying his circulation and speed. Though Gear Second exhausts Luffy rapidly, it proves sufficient to defeat Lucci, establishing that Luffy can push beyond normal capabilities through innovative technique. The Going Merry's destruction represents genuine loss. Despite the crew's victory, the ship that carried them through their early adventures was beyond repair. The ship's destruction grounds the arc emotionally — not every situation ends with complete victory. The arc concludes with the World Government formally declaring the entire Straw Hat crew enemies of the state, transforming One Piece from adventure narrative into an increasingly revolutionary struggle against global systems of oppression.