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.

Long ago, Sunset Manor was the site of a gruesome massacre...and an unsolved mystery. Now six master detectives have been invited to the manor to play a deadly game hosted by Japan's greatest phantom thief. A lost treasure, an impossible poisoning, a message in blood, ominous images of crows; it's all part of a puzzle not even the sleuths can solve, especially after they start turning on each other. The only one who can win the game and stop the deaths from piling up is the uninvited seventh detective: Conan!