In the midst of autumn, a bombing occurs at Nichiuri TV, where the popular Hyakunin Isshu karuta tournament is being filmed. Amidst the chaos and burning building, only Heiji and Kazuha are left inside. Conan rushes to the scene and rescues them just in time. The identity and motives of the bomber remain a mystery. As the investigation unfolds, a mysterious woman claiming to be Heiji's fiancée appears, and a murder occurs at a Japanese house in Arashiyama, Kyoto's outskirts. The case takes a surprising turn when Momiji, the Kyoto High School karuta champion, reveals she was present at the crime scene and has a connection to Heiji's past. As the inquiry deepens, Conan and Heiji uncover secrets surrounding the Hyakunin Isshu and the murder, leading them to the shocking truth.

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