This is a 12 episode series showing different cases Kudo Shinichi solved before he became a kid named Edogawa Conan. The story starts with Shinichi and Ran, his childhood friend and classmate, woke up trapped in a white room with a particular thing that reminds Shinichi of a case he solved in the past which shows a flashback of the case which is also the content for an episode. A podium like in the center with a screen displaying a keyboard and some blanks to be filled. Once they answered the question correctly, a door opens which leads to another room and traps them again with another podium like in the center to be answered.