Jack teaches Sora how to sail the Caribbean with his new ship and they meet Luxord, who through Parliament challenges them to a boat race to Port Royal and whoever I won, they will get what they want. Meanwhile, Jack, Sora, Donald, and Goofy explore the islands and find a cavern with a large ship, ready to set sail. Meanwhile, Jack is captured by Lord Beckett and talking of a deal. Sora fights them, but in battle, he gets separated from his pirate friends and is stranded with Donald and Goofy on a remote island, with a strange Jack Sparrow. The Black Pearl manages to leave the Realm of Davy Jones and return to the waters of the Caribbean, but are ambushed by the Heartless. Unfortunately, this reaches the ears of the Organization and Luxord is in charge of obtaining that chest, as he knows this world well. The only way to pay off his debt without dying is to find the chest that holds Davy Jones's heart. Tia Dalma, a "friend" of Sparrow, tells Sora of Jack's debt to Davy Jones, about how he wishes to get rid of the creature that hunts him the Kraken.
They catch up on what was happening in the pirate world and must face a ruthless pirate named Davy Jones.
After obtaining the Black Pearl stolen by the Heartless, they take it back to the sea, where they meet other familiar faces: Will, Elizabeth, Barbossa. Wandering aimlessly through the desert, they spot the Black Pearl and with it, the witty Captain Jack Sparrow. The three friends appear in the middle of the ocean in a rusty raft and are dragged to the End of the World, entering the Realm of Davy Jones. In addition to the interference of Organization XIII, Sora will learn to navigate the seven seas and save his comrades from them. Sora, Donald and Goofy appear again in the pirate world, but some events have been missed Jack's debt to Davy Jones, Lord Beckett hunting pirates and controlling the seas, the convening of the Pirate Brotherhood Assembly against Lord Beckett and Davy Jones, and the search for Davy Jones's chest (which contains his heart).