On New Years day there was a soccer game taking place in Tokyo and the Detective Boys including the new member, Ai Haibara got to watch the game. During the game the TV station was forced to aim the camera below where the Detective Boys were sitting and where the soccer ball was. Then the soccer ball jumped up and deflated. Conan jumps down and realizes that the ball was shot by a gun with a silencer on it. The caller who forced the station to aim the camera also forces them to pay huge amounts of money or else, someone dies!

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.