传说中的黄金大盗乌南，带着大批黄金隐居到某座岛屿，之后生死不明，向着伟大航道持续前进的的鲁夫一行人，遇到了梦想成为乌南的部下的少年托比欧，他因为不愿继承爷爷经营的关东煮摊，和爷爷闹的很不愉快，而爱黄金成痴的海贼艾拉德哥也正窥视著乌南埋藏的黄金……
Woonan is the legendary Great Gold Pirate, earning the nickname after accumulating about 1/3 of the gold available in the world. Even after his disappearance, the tales of his gold being stashed away in a remote island continue to persist, a juicy target that other pirates lust for.
One of the pirates going to great lengths to attain the treasure is El Drago. He and his crew have hunted down Woonan's former crew members one by one, and along the way, they find the map that will take them to the hidden island.
The map is not all they come across; they also manage to come into contact with the straw hat pirates. After a short battle, Luffy and company are robbed and separated from one another. Now they must find a way to make it to the island before El Drago does and take the legendary treasure for themselves.
