Mitsuhiko, Genta, Ayumi, and Haibara discover the body of serial blackmailer KUMO at a construction site. Conan is visiting the hot springs with Kogoro and learns about the case when Mitsuhiko contacts him. The Detective Boys witnessed a tall man fleeing the crime scene around the time the murder took place. The police believe KUMO was blackmailing ten men and one woman. However, all 11 of them have alibis, and the investigation comes to a standstill. When Conan hears about the situation, he notices a few inconsistencies...

Conan, Ayumi, Genta, Mitsuhiko, and Haibara return to Professor Agasa's home after a BIG Osaka versus Tokyo Spirits match. Haibara realizes the Higo phone strap she purchased is missing. She lost it while they were on the train. In the video Mitsuhiko recorded by coincidence is a sun-tanned man with a mustache picking up the strap. Conan and his friends go to look for the strap for the heartbroken Haibara, but...