Meitantei Conan OVA 06: Kieta Daiya wo Oe! Conan & Heiji VS Kid!
English title: Detective Conan OVA 06: Follow the Vanished Diamond! Conan & Heiji vs. Kid!
Japanese title: 名探偵コナン 消えたダイヤを追え! コナン・平次vsキッド!
Type: OVA
Source: Manga
Episodes: 1
Status: Finished Airing
Aired: Mar 15, 2006
Duration: 23 min
Rating: PG-13 - Teens 13 or older
Studios: TMS Entertainment
Producers: Polydor Records
Genres: Comedy, Mystery
Themes: Detective
Demographics: Shounen

One day Mori Kogoro's private detective agency receives a blackmail call. It turns out that the caller has dialed the wrong number. Conan is able to identify the voice on the phone, it's similar to that of his old friend Heiji, who's also a high school detective but in Osaka. They join once again forces to solve the case and find the jewel which was stolen. 

But they are not the only ones who are after the jewel. The notorious master thief Kaitou Kid has taken an interest in this piece, which is worth 100,000,000 Yen, as well and now it's up to Heiji and Conan to be the first to find the culprit and acquire the jewel. 

(Source: AniDB)