Is Meitantei Conan: Episode One - Chiisaku Natta Meitantei hentai?
English title: Detective Conan: Episode One - The Great Detective Turned Small
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

TV Special · 2016 · 1 episodes · PG-13 - Teens 13 or older
Adventure, Comedy, Detective, Mystery, Shounen
The "real" episode 1 of Meitantei Conan written by the Mangaka Gosho Aoyama.
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