During the stormy season, Lufei, Naomi, Sauron and others boarded a sinking pirate ship and found a huge treasure chest. After a lot of trouble, they finally brought the box back to the Merry. It turned out that there was no gold and silver treasure in the box, but an old woman who looked strange and somewhat out of line. Fearing that Lufei might kill herself, the old woman promised to exchange her life with the secret of the golden crown. The so-called golden crown, legend is a priceless crown, only the real king of the sea can have. Lufei believed the old woman's words and set sail towards the target land. Everyone came to the mechanical island where the old woman lived, but Lanchet, the son of the old woman, thought Lufei and others were thieves who hijacked his mother. As he rescued his mother, he used the giant mechanical soldier he had developed to attack the Merry. There are many crises on the way to find the Golden Crown.
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