Kenyu Horiuchi

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.

Zen Seizaki, a public prosecutor at Tokyo District Public Prosecutors Office, is investigating a case of illegal clinical research related to a drug company and a university. During the investigation, he finds a file that Shin Inaba, an anesthesiologist, kept, which includes blood that is mixed with hair, skin, and a paper written with letter F. As he investigates, he realized there's a hidden plot that is connected with a huge election as well as to a certain person who is in charge of it.