If you loved Detective Conan: One-Eyed Flashback, try Detective Conan: Episode One - The Great Detective Turned Small
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.
You already loved

Detective Conan: One-Eyed Flashback
→
Try this next

Detective Conan: Episode One - The Great Detective Turned Small
What they share
Theyboth carry the foreign gem mood tag, and they sit in Animation / Crime / Mystery territory. If that's the register that drew you to Detective Conan: One-Eyed Flashback, the second film will land in a comparable space — through a different lens.
foreign gem
What Detective Conan: Episode One - The Great Detective Turned Small is
Amid spring’s cherry blossoms, a brass lighter clicks shut. A teen sleuth fails to light one; the bomber laughs, then vanishes. Kid Conan’s case begins in 2017 Shōnen Sunday flashback mode.