The Detective Boys are wandering the streets in the residential area around Professor Agasa's house, worrying about Ai Haibara, who has gone missing since she went shopping several hours ago. At first, Genta, Mitsuhiko, and Ayumi are wondering whether Ai has become the victim of a traffic accident, but then Conan finds a cat's shawl lying on the street. Seeing this, he remembers how he, Ai, and the Professor recently met a friendly young woman named Mitsuru Higaki, along with her pet cat Chiro (who wore the shawl) and her Indian Star Tortoise. Searching the vicinity for Chiro, they find the kitten inside a well in a park, but as they try to return it, Mrs. Higaki does not answer the doorbell, so they take the cat back to Agasa's house to feed it. After contacting Detective Chiba to learn whether there have been any accidents in the area (none have), Conan tries to contact Ai through her badge, but to no avail.