Hattori Heiji invites Kogoro, Ran, and of course Conan to Osaka. Heiji takes them around the city and soon bumps into Kazuha, Heiji's friend. Kazuha who meets Ran mistakes Ran for Heiji's girlfriend and also thinks Ran is Kudo, the name that Heiji has mentioned to her. Heiji laughs at Kazuha and says that the Kudo he was talking about was a boy, Kudo Shinichi, the famous high school detective who had shrunk into Edogawa Conan. Heiji who had promised not to tell anyone that Conan was really Shinichi kept his mouth shut even to Kazuha. Conan was freaked out when Kazuha said 'Kudo'. Later 2 people get murdered and its up to Conan and Heiji to solve the case!