Nami accidentally got a map of Zhenshou Island, which is said to be buried with priceless treasures. The Straw Hat Pirates decided to advance to the island despite Chopper's obstruction. At this time, an underwater volcano erupted, throwing the Golden Merry into the air. By chance, they were thrown to Zhenshou Island. This island is ruled by animals that can speak human language. Their old king, Kirin Lion, has passed away. Chopper, who accidentally fell here, was regarded as the new king by the beasts. Chopper couldn't beat the beasts and served temporarily. Just as Zhenshou Island was rejoicing for the birth of the new king, the greedy and evil Count Battra and his minions landed on the island. For the legendary "King's Treasure", he did not hesitate to kill the animals on the island. They are also bound to clash with the Straw Hat Pirates... This film is adapted from the original work of the same name by Japanese cartoonist Eiichiro Oda, and is the third animated theatrical version released in 2002.