Water 7 Saga

The Water 7 Saga (ウォーターセブン編), also referred to as the Water 7–Enies Lobby Saga (ウォーターセブン・エニエスロビー編),, "World Government Saga" and "CP9 Saga", is the forth saga of the manga and anime One Piece, continuing from the Sky Island Saga, and the fourth saga of the first half of the series.

After their adventure in Skypiea, the Straw Hat Pirates land safely back in the Blue Sea, only to find themselves confronted by the Foxy Pirates in a Davy Back Fight. Then, the crew reaches Water 7, where they soon fall into trouble though, making enemies with the Franky Family and CP9 of the World Government. The crew also begins to fall apart. On Enies Lobby, it comes to the showdown between the Straw Hats and CP9. While these events are happening, a fateful duel between Ace and Blackbeard takes place.

Story Arcs

 * Long Ring Long Land Arc: (Manga: 2003-2004) (Anime: 2004-2005)
 * Water 7 Arc: (Manga: 2004-2005) (Anime: 2005-2006)
 * Enies Lobby Arc: (Manga: 2005-2006) (Anime: 2006-2007)
 * Post-Enies Lobby Arc: (Manga: 2006-2007) (Anime: 2007)

Filler Arcs

 * Ocean's Dream Arc (2005)
 * Foxy's Return Arc (2005)

Trivia

 * This is currently the third longest saga in the manga, after the Dressrosa Saga and the Wano Country Saga.
 * This is the only saga in the first half of One Piece to not introduce a new Warlord of the Sea.
 * It is during this saga that the Straw Hats' need for a shipwright, as well as a new ship to replace the Going Merry, becomes clear. This saga is the last saga to feature the Going Merry and was the first saga to feature the Merry's successor, the Thousand Sunny.
 * This saga involves several members of the Straw Hats leaving the crew temporarily. During the Long Ring Long Land Arc, Chopper is forced to leave the crew during the Davy Back Fight between the Straw Hats and the Foxy Pirates (in the anime, Robin is forced to leave during the Davy Back Fight as well), though the Straw Hats later win him (and Robin in the anime) back. During the Water 7 Arc, Usopp leaves the crew following his and Luffy's fight over the Going Merry, while Robin is forced to leave due to the threat CP9 and the Buster Call pose to the Straw Hats. Robin later rejoins the crew during the Enies Lobby Arc, while Usopp officially rejoins (as he used his Sogeking alter ego during the later part of the Water 7 Arc and the whole of the Enies Lobby Arc) during the Post-Enies Lobby Arc.
 * The Marine Admirals were first introduced in this saga, though only Aokiji and Akainu (during Robin's flashback of the Ohara Incident) actually appear. Kizaru is only mentioned briefly by Robin (he would later appear during the Sabaody Archipelago Arc in the Summit War Saga).
 * This saga also introduced the World Government's Cipher Pols, the judicial island of Enies Lobby, the Gates of Justice, and the Buster Call. Impel Down and Marineford are also mentioned.
 * Robin and Franky's back histories are revealed during this saga and their potential to revive the Ancient Weapons, Pluton is explained.

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