Conan, Ran, and Kogoro are out to eat when they meet students from Beika University. A murder occurs on the street, but somehow the blood ended up on the wall of a building, the railing of a rooftop, and broken glass of an upper apartment window! Conan is after the cunning killer imbedded in an outwardly innocent mountain-climbing fraternity, desperately trying to hide deadly secret!

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.