A special commemorating the 20th anniversary of the anime series. The special is a retelling of how Kudo Shinichi was transformed into a child.
<br><br>
It all started when Ran lost her smartphone. Shinichi  promises to replace it, but the high schooler is  already making his name as a consulting detective for the police; when  he abruptly leaves her karate tournament to skillfully solve a  high-society murder case, Shinichi's going to have a take Ran on a  special date to get back on her good side. A colorful amusement park  beckons — and so does a horrifying act of homicide!<br><br>

(Source: Anime News Network, TMS Anime)

Case Closed: Episode One - The Great Detective Turned Small