A man arrives at the Mori Detective Agency claiming his girlfriend has been kidnapped by a red sheep. The man received a threatening message, but for some reason, there was no demand for a ransom. Upon seeing the sheep, Conan and Ran feel like they once saw the same sheep a long time ago. Kogoro and the client head to the park at night, but... Meanwhile, curious about the red sheep, Conan and Ran head to the park as well.