- After Kageyama journeys to Hong Kong to make his annual report to Hosho Reiko's father, a charred body that appears to be the world famous artist Matsushita Keizan is discovered within the jurisdiction of Kokuritsu Police Precinct, which has not had a big case in along time. Inspector Kazamatsuri Kyoichiro hastens to investigate and is more hyped than usual. Kazamatsuri , who learns that a vein authentication system was set up in the studio and no one but Matsushita could come and go, declares to the media that it is a murder in a locked room. It is a locked room, but because it will not function without vein authentication of the living person, it is probably not a murder. Who is about to go back to dinner, recalls another big case that she starts talking about. This is a story of a sudden office excursion to Okinawa at the suggestion of Kazamatsuri...