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.

The Metropolitan Police force is in an uproar over the big news: at long last, star-crossed police detectives Sato and Takagi are going on a date! But their romantic afternoon at an amusement park turns into a roller-coaster ride when they find a backpack full of smuggled heroin. Can Conan catch the drug runners and save the detectives' date? Then the Junior Detective League decides to track down Doc Agasa's long-lost first love. But to find her, they'll have to crack a numerical code that takes them on a wild goose chase through the local zoo!