Detective Conan: Jolly Roger in the Deep Azure

The Seabed Palace is an ancient ruin submerged beneath the waves near the Isle of Koumi. According to local legend, it houses the treasure of the famed female pirates Anne Bonny and Mary Reed, making it the focus of the treasure hunters' expedition.

Anne Bonny and Mary Reed were legendary female pirates whose treasure is said to be hidden within the Seabed Palace. Their historical reputation as pirates adds credibility to the legend that draws treasure hunters to the island.

Conan and his friends are on vacation at the Isle of Koumi when they encounter the group of dubious treasure hunters who are also pursuing the Seabed Palace legend. Their involvement stems from being at the right place at the right time and their natural tendency to investigate criminal activity.

The treasure hunters are described as dubious because they are pursuing the legend with questionable methods and motives. Their presence creates tension and conflict, leading to the central mystery that Conan must solve.

The Seabed Palace is an ancient ruin submerged beneath the waves around the Isle of Koumi, a picturesque Pacific island. Its underwater location makes the treasure difficult to reach and adds to the mystery of the legend.

As a detective mystery, Conan uses his analytical skills to decipher clues related to the legend and outsmart the antagonistic treasure hunters. His investigation involves piecing together the truth behind the Seabed Palace legend.

Following the franchise's typical happy ending conventions, Conan and his friends successfully solve the mystery and thwart the villains. The treasure hunt concludes with the protagonists achieving their goal, as is standard for the Detective Conan adventure series.

Koumi Island serves as the central setting because it is the location of the Seabed Palace legend. Its picturesque Pacific location and preserved local legend about the submerged ruins drive the entire treasure hunt plot.