Conan Edogawa pulls Heiji Hattori and Kazuha Toyama out of a burning television studio after a bomb goes off during the filming of the Satsuki Cup, the national karuta championship played on the Ogura Hyakunin Isshu. In the aftermath a girl named Momiji Ooka presents herself as Heiji's fiancee, holds the Kyoto high school karuta title, and turns out to be the opponent Kazuha will face in the tournament. This manga adapts the twenty-first Detective Conan film.