One Piece: The Giant Mechanical Soldier of Karakuri Castle

Monkey D. Luffy is always getting into intriguing adventures; he never spends a single dull day, and he often lands in ridiculous situations, only to come out of them miraculously ahead. One day he and his loyal crew salvage a mysterious treasure chest from a sinking ship. The Straw Hats can barely wait to open it, since it might hold something valuable, but when they finally look inside, instead of mountains of jewels they find a frightened old lady.

The old woman asks the pirates for help and promises to reward them handsomely if they take her home to Mecha Island. She tells them about a marvelous treasure, a golden crown, and even though her tale sounds rather far-fetched, it only fuels their curiosity. The pirates head to the mysterious island, where they are attacked by its lord. He soon has a change of heart, however, and decides to enlist their help in solving the mystery of the Golden Crown. Along the way the crew will uncover the island's secret and enjoy plenty of madcap adventures.