In Osaka, the Great Detective of the West, Heiji Hattori, his childhood friend Kazuha Toyama and Conan, run into a woman who insists that she is Heijis fiancé. Her name is Momiji Ooka. This woman turns out to be a high school champion of the 100 famous poems by 100 famous writers card game. At about the same time, at the Japanese house in Arashiyama, Kyoto, the winner of the Satsuki Cup is killed. The person who appeared on the monitor at the crime scene was Momiji. And a certain song kept on playing deeply in the background. Osaka and Kyoto, Heiji and Momiji, two cases. The fate of the two are spun together by an old love song of long, long ago.