Xiaolan's friend, the Suzuki Group of the Atom family, is preparing to exhibit the treasure of Tsar Nicholas II's family, the Egg of Memories. The Egg of Memories contains precious photos of Tsar Nicholas II's family, which makes it particularly precious. Unexpectedly, before the exhibition, they received a notice from Kaito Kid, which listed the time of his theft in a riddle. Atom asked Xiaolan's father, the famous detective Maori Kogoro, for help. Of course, the real master behind the scenes, Conan, will also come with Xiaolan. Conan met Hattori Heiji, who is also a detective, and the two decided to work together to solve the mystery of Kaito Kid!