Volume 1

It is the first volume appeared in Japan at June 18, 1994 and in the US at September 7, 2004.

Chapters

 * File 1: A Modern-Day Sherlock Holmes (平成のホームズ, Heisei no Hōmuzu)
 * File 2: The Great Detective Turned Small (小さくなった名探偵, Chīsaku natta meitantei)
 * File 3: The Unwelcome Great Detective (仲間はずれの名探偵, Nakama hazure no meitantei)
 * File 4: The Sixth Smokestack (6本目の煙突, Ropponme no entotsu)
 * File 5: The Other Perpetrator (もう一人の犯人, Mō hitori no han'nin)
 * File 6: From Third-Rate to Great Detective (迷探偵を名探偵に, Meitantei o meitantei ni)
 * File 7: The Bloody Case of the Lovely Pop Idol (血ぬられたアイドル, Chi nurareta aidoru)
 * File 8: Resemblance (あなたに似た人, Anata ni nita hito)
 * File 9: An Unfortunate Misunderstanding (不幸な誤解, Fukō na gōkai)

Synopsis
High school detective Jimmy Kudo is really good at solving crimes. His best friend, Rachel Moore, is worried that one day he'll get in too deep, but he casually brushes off her concern. After noticing two suspicious men in black clothes at a festival murder scene, Jimmy sights one of them later and decides to follow him, only to be attacked from behind. The attacker, a crime syndicate lord, force-feeds Jimmy a newly-developed, undetectable poison instead of killing him outright. But instead of the poison killing him, it turns his body into that of a grade schooler. To prevent a followup attack on him or his family and friends, Jimmy adopts the pseudonym Conan Edogawa, one that he must use even in front of Rachel. He quickly finds that no one will listen to a child, and is forced to solve crimes through Rachel's incompetent P.I. father, Richard Moore, with help from Dr. Hiroshi Agasa's voice-modulating tie and his own ingenuity. Along the way, Rachel reveals her true feelings to him, and he vows to do whatever is necessary to get his original body back and return her feelings.