Conan, Ran, and Kogoro arrive in Hiroshima to meet a film crew who plan to film them touring Miyajima, Hiroshima. The assistant producer, Yuuichi Kitamura, gets severe stomach pain that causes him to be bedridden. They take a ferry to Miyajima and begin filming. In front of Itsukushima Shrine, a crew member finds out salt was added to his drink; the film crew then notices a familiar man in a crowd and assumes him to be at fault. The film crew arrives at a red-leaf bun pastry shop owned by Yayoi Ayase which has a specialty of red-leaf bun called Misen’s Seven Wonders, based on the seven wonders of Mount Misen: The eternal flame of Daishō-in, The plum tree grown from Kūkai’s khakkhara, a boulder that ebb and flows the saltwater of Hiroshima Bay, a boulder inscribed with Kūkai’s writing, the sound of a goblin’s clapping, a special cherry blossom that undergoes deciduous all season long, and lights dubbed as dragon fire over Hiroshima Bay.
