Monkey D. Luffy, who gained the power to stretch like rubber but lost the ability to swim, is determined to find One Piece--the greatest treasure in the world.
When Fish-Man Island's fate hangs in the balance between the merfolk who want to carry out their dead queen's wishes and the pirates who want to rule it themselves, Luffy must decide its fate, but he might decide to destroy the island instead.
While the merfolk's kingdom is under attack by the humans, Luffy escapes the castle on Fish-Man Island with the princess and they head to the Fort of the Sea.
Having injured Whitebeard, the Navy launches an attack intended to quash the pirate rebellion once and for all. Meanwhile, Luffy needs one more trick to get past the three Navy Admirals who are keeping him from rescuing his brother from execution.
Buggy the Clown, Mr. 2 Bon Clay, and Mr. 3 become Luffy's allies while Warden Magellan uses his Venom-Venom powers to try to stop Luffy from breaking his brother out of Impel Down.
Luffy sneaks into the Naval prison Impel Down on a mission to save his brother, Ace, and runs into some former enemies who might actually be able to help him.
The Straw Hats come into contact withWarlord of the Sea Bartholomew Kuma's bare paw and it transports Luffy to an unknown island where he encounters Amazons and scatters his crew all over the world.
