The Mini Patrol Car Police's Big Chase Miyamoto Yumi and Miike Naeko are driving around in their patrol car. Yumi wishes for a big case to happen like those in drama. They meet the Detective Boys who are chasing after Genta as he got kidnapped by two men. The Detective Boys got into the patrol car and chase after them. Through the detective badge, Conan overheard the kidnappers saying they would clean up on diamonds and the group assumed they were jewel thieves. Conan figures out where the kidnappers are headed and rescues Genta. It turns out the kidnappers are part of an organisation that smuggles protected whitebait eels to overseas illegally.