If you loved Jam Films, try The Files of Young Kindaichi: Legend of the Shanghai Mermaid
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

Jam Films
→
Try this next

The Files of Young Kindaichi: Legend of the Shanghai Mermaid
What they share
Both films are directed by Yukihiko Tsutsumi, and they both carry the foreign gem mood tag, and they sit in Drama territory. If that's the register that drew you to Jam Films, the second film will land in a comparable space — through a different lens.
foreign gem
What The Files of Young Kindaichi: Legend of the Shanghai Mermaid is
Detective kid meets Shanghai noir. A circus murder drags the teenage sleuth into a 4,000-year-old mermaid myth. A sharp-eyed teen unravels both.