The Beika City Shopping Center Garbage Bin Mystery Conan, along with Haibara, and Detective Boys was cleaning the shopping district as a class activity. At that time, the mountain of garbage which gathers in a part by the wall is found. There seems to have been a trash can originally there. There, Conan and his friends learn about the existence of a woman named Chiemi Isojima who was cleaning this area alone. In the shopping district, the number of restaurants and other stores increased, and they were also concerned about the installation of trash cans; they couldn't stand the overflowing trash, so they removed the trash cans...