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Detective Conan OVA 03: Conan and Heiji and the Vanished Boy Info:

Plot Summary: Conan and Ran are visiting Heiji and Kazuha in Osaka but while they are touring around they come across a group of three kids that look like Ayumi, Mitsuhiko, and Genta. The group are looking for their missing friend and Conan agrees to help.

Detective Conan OVA 03: Conan and Heiji and the Vanished Boy Episodes: