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, slow burn mood tags, 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.
outsiderslow burn
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.