One day Mori Kogoro's private dective 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 Yen, as well and now it's up to Heiji and Conan to be the first to find the culprit and acquire the jewel.

Kudo Shinichi is a seventeen year-old high school detective whom people call the "Modern Sherlock Holmes." However, one night after a date with his childhood sweetheart, Ran, Shinichi witnessed an illegal trade and, caught off his guard, was knocked unconscious and fed a drug that was supposed to kill him... but he woke up and found himself shrunken to a seven year-old. In order to track down the men who did this to him, Shinichi hid his identity and lived with Ran, whose father happened to be a hopeless detective, and with that came a series of murders and mysteries that he must solve. 
(Source: Anime News Network)
 
Note: 
- Includes Keisatsu Gakkou-hen - Wild Police Story in episodes 1029, 1038, 1042, 1061 
- Episodes 11, 52, 76, 118, 162, 184, 208, 342, 356, 449, 452, 487, 488, 489, 490, 515, 516, 521, 522, 651, 734, 804, 805, 927, 928 aired with a runtime of ~50 minutes as opposed to the standard 25 minute long episode. 
- Episodes 96, 129, 174, 219, 263, 304, 383, 479 aired with a runtime of ~90 minutes as opposed to the standard 25 minute long episode. 
- Episode 345, 425 aired with a runtime of ~115 minutes as opposed to the standard 25 minute long episode.

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