If you loved Mononoke the Movie: Chapter II - The Ashes of Rage, try Lonely Castle in the Mirror
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

Mononoke the Movie: Chapter II - The Ashes of Rage
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Lonely Castle in the Mirror
What they share
Theyboth carry the outsider mood tag, and they sit in Animation / Fantasy / Mystery territory. If that's the register that drew you to Mononoke the Movie: Chapter II - The Ashes of Rage, the second film will land in a comparable space — through a different lens.
outsider
What Lonely Castle in the Mirror is
Moonlit bedroom mirror reflection summer evening. Shy girl finds portal in mirror leads to mystical castle with six other students. A Keiichi Hara anime of psychological fantasy.