If you loved The Girl from the Other Side, try Mononoke the Movie: The Phantom in the Rain
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

The Girl from the Other Side
→
Try this next

Mononoke the Movie: The Phantom in the Rain
What they share
Theyboth carry the surreal mood tag, and they sit in Animation / Fantasy / Mystery territory. If that's the register that drew you to The Girl from the Other Side, the second film will land in a comparable space — through a different lens.
surreal
What Mononoke the Movie: The Phantom in the Rain is
The Edo harem corridors, slick with evening rain. Two new concubines sidestep whispers that cling to the walls. Beneath a lantern’s yellow glow, a sodden figure steps from the shadows, medicine gourds rattling.