In a world where a mysterious substance called Pure Gold can grant unimaginable wealth and power, a young girl named Olga finds herself at the center of a dangerous game of cat and mouse. Pursued by both the World Government and a ruthless treasure hunter named Mad Treasure, Olga joins forces with the Straw Hat Pirates in a race against time to find the Pure Gold on the lost island of Alchemi, which is guarded by a fearsome sea monster. As the stakes rise and the battle for control of the Pure Gold intensifies, Olga must confront her own demons and learn to trust her newfound allies in order to survive. But with the fate of the world hanging in the balance, will the Straw Hats be able to overcome the odds and claim the Pure Gold before it falls into the wrong hands?

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Some movies that have similar genres and were produced around the same time as One Piece: Heart of Gold include Raya and the Last Dragon, Checkered Ninja, Clara, Slugterra: Into The Shadows, Puss in Boots, Brave.