A bombing case at Nichiuri TV in autumn. The Satsuki Cup, which crowns the winner of Japan's Ogura Hyakunin Isshu based competitive karuta tournament, is currently being filmed inside the facility. The incident results in a big commotion and, while the building is burning to ashes, the only people left inside are Heiji and Kazuha. They get rescued just in time by Detective Conan, who rushes to the scene. Both the identity and motive of the bomber are unknown.