He chose the path of a detective in order to die... It is the 2030s. The "Junior Detective Team" gathers under the mysterious detective Kogoro Akechi. They use their natural ability to solve large and small incidents. One day, member Kensuke Hanasaki met the mysterious boy Yoshio Kobayashi. Kobayashi, who became "unable to die" due to the "unidentified smoke", is looking forward to his own death and refuses to contact others. Hanasaki, who is interested in his existence, asks him, "Do you want to join the 'Junior Detective Team'?"... Kobayashi and Hanasaki. Their encounter will eventually intertwine with the fate of the century's criminal, the Twenty-Faced Monster, and Kogoro Akechi, and promote the fate of the two...