Conan, Ran, and Sonoko visit the hotel room where Masumi Sera is living. In the hallway on the 30th floor of Sera's hotel, various editors wait for famous romance author Hiura Keigo to finish his manuscripts. Later, Hiura's assistant Minazuki Chiori is found murdered in the room directly below Hiura's.

Conan, Kogoro, and Ran take a trip to Ishikawa Prefecture's Kanazawa to meet with a tourism agency. They have asked for Kogoro's help with the Kaga Hyakumangoku Mystery Tour city revitalization event to be held in the Kanazawa.