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.

Source: ANN

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Parent story: Meitantei Conan
Prequel: Meitantei Conan: 16-nin no Yougisha!?
Sequel: Meitantei Conan: Conan to Kid to Crystal Mother