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.

Stuck in the middle of a forest, Conan, Rachel, and Richard seek shelter at a temple where a Tengu (long-nosed goblin) is said to have murdered people. That night, the elder priest is found dead, hanging from a beam in a room with an incredibly high ceiling. No one could possibly have hanged himself from up there, and it couldn't be the work of any other human. Could the mythical Tengu really have done it?