Inspector Megure, Xiaolan's mother Kissing Eri, and Dr. Agasa were successively plotted against by unidentified persons. Conan tracked down the murderer who hurt Dr. Agasa. Based on the clues left at the scenes of several cases, he found that the murderer committed the crimes in the order of playing cards, and the victims were all related to Maori Kogoro. The clues provided by Megure initially revealed the truth of the matter. It turned out that when Maori was a policeman, he had arrested the gambler Murakami Takeru who committed murder. This incident also led to Maori's resignation and marriage changes. Ten years later, Murakami Takeru, who had served his sentence, was released from prison and began to retaliate against the people around Maori according to the order of playing cards. After learning the whole story, Maori tried hard to find people around him who were related to numbers. In the process, various thrilling scenes appeared one after another. And Conan also began to doubt the truth of the case...