Detective Conan: Jolly Roger in the Deep Azure
The Isle of Koumi is a picturesque island in the Pacific Ocean that is home to many people. An old tradition of the Seabed Palace, an ancient ruin at the bottom of the sea, where the treasure of two female pirates, Anne Bonnie and Mary Reed (who actually existed 300 years ago), was left, is passed down from generation to generation on the island. When Conan and his buddies go on vacation to Koumi Island, they come into a group of treasure seekers. They had a dubious air about them.