An autumn bombing incident at Nichiuri TV. Filming for the Satsuki Cup, which determines the champion of Japan's Hyakunin Isshu, is happening inside the building right now. Heiji and Kazuha are the only ones still within the structure after the incident, which causes a large disturbance. Conan arrives to the scene and saves them just in time. The bomber's identity and motivations are both unknown. Conan encounters a mystery, attractive girl who says she is "Heiji's fiancée" as chaos reigns after the explosion. Momiji Ooka, who represents Kyoto High School, won the Karuta competition. As fate would have it, Momiji and Kazuha will compete in the Hyakunin Isshu.