Conan and Kogoro are enjoying a meal at an Italian bar in an alley while chatting with the owner Yamaura when the wall is suddenly demolished. The culprit is Kusumi, the owner of the alley, who has been harassing shop owners who refuse to vacate the alley. One shop owner even died from the stress. Sushi restaurant owner Fumio and creative cuisine restaurant owner Yonezawa arrive when they hear the commotion, and with their help, they successfully run off Kusumi. But when Kogoro visits the bathroom a while later, he discovers someone inside...