Conan and his friends were playing Frisbee at the park, when a dog named Matsunosuke launched off of Conan's head and caught the Frisbee. Matsunosuke's owner, Kanae Asakawa, apologized and took Conan's jacket in order to get it cleaned after Matsunosuke left dirt all over it. The next day when Conan and the Detective Boys arrived at her house to get the jacket they met Kanae's friend Tomoko and see Matsunosuke in his dog house, asleep.