Shinichi Kudo is a 17-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 was knocked unconscious and fed a drug that was supposed to kill him... but he woke up and found himself shrunken to a 7-year-old. In order to track down the men who did this to him, Shinichi reinvented his identity as Conan Edogawa 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.