Kaito and Aoko are travelling on a train along with Aoko's father, Inspector Nakamori, in attempts to help stop Kaitou Kid from stealing a precious gem known as Crystal Mother. Little do Aoko and Inspector Nakamori know that Kaito is Kaitou Kid and he will do whatever it takes to retrieve the gem. Unfortunately for Kaito, he is also being followed by Conan and a little boy named Phillip who will do anything to stop him.

Source: ANN

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Parent story: Meitantei Conan
Prequel: Meitantei Conan: Conan to Heiji to Kieta Shounen
Sequel: Meitantei Conan: Target wa Kogorou!! Shounen Tanteidan Maruhi Report
Alternative version: Magic Kaito
Alternative version: Magic Kaito 1412