Detective Conan OVA 03: Conan and Heiji and the Vanished Boy(2434)

Other Title(s)名探偵コナン: コナンと平次と消えた少年
Genre(s)Adventure, Mystery
SynopsisConan 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)