If you loved The Garden of Sinners: Overlooking View, 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

The Garden of Sinners: Overlooking View
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Lonely Castle in the Mirror
What they share
Theysit in Animation / Fantasy / Mystery territory. If that's the register that drew you to The Garden of Sinners: Overlooking View, the second film will land in a comparable space — through a different lens.
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.