Jimmy Kudo, the son of a world-renowned mystery writer, is a high school detective who has cracked the most baffling of cases. One day while on a date with his childhood friend Rachel Moore, Jimmy observes a pair of men in black involved in some shady business. The men capture Jimmy and give him a poisonous substance to rub out their witness. But instead of killing him, it turns him into a little kid! Jimmy takes on the pseudonym Conan Edogawa and continues to solve all the difficult cases that come his way. All the while, he's looking for the men in black and the mysterious organization they're with in order to find a cure for his miniature malady.

A pro wrestler is murdered before a match, and the killer is caught on camera: the famous masked wrestler Wolf Face! But was it really Wolf Face behind the mask, or is someone trying to frame the champ? It's up to Conan to identify the murderer--and up to Rachel to pin him to the mat!