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.
Kogoro's detective agency receives a mysterious phone call. Someone on the other end warns about a bomb and leaves behind a code, "The Boy in Blue and The Blue Zebra, the rain from above ..." If Conan can decipher the riddle, he can stop the bomb. An adventure begins for Conan and the Detective Boys, taking place at a soccer match between Hideo Akagi of the Tokyo Spirits and Ryusuke Higo of Big Osaka