Meitantei Conan: Konpeki no Hitsugi (Jolly Roger)

The Isle of Koumi, a beautiful island in the Pacific Ocean. On the island, people pass an old legend down from generation to generation that there was the Seabed Palace, an ancient ruin at the bottom of the sea, where the treasure of 2 female pirates, Anne Bonnie & Mary Reed (who really existed 300 years ago), was left. When Conan and his friends visit Koumi Island while on vacation, they meet some treasure hunters. There was something suspicious about them.

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Rumors tell of a magnificent treasure buried at the bottom of the sea near Koumi Island - the very place that Conan, Mori, Sonoko and the rest of the gang have just arrived at to take a vacation. The treasure supposedly has something to do with Anne Bonnie and Mary Reed - two female pirates who lived hundreds of years ago. Conan and his friends soon find themselves in the middle of a grand adventure involving deep sea diving, planned shark attacks, kidnappings, and the most important element of all: the famed pirate treasure itself!