Total Recommendations: 2
If you liked
Oniisama e...
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...then you might like
Simoun
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Similar aesthetics and atmosphere. I recon Simoun takes a lot of inspiration from these stories from the 70's.
If you liked
Mai-Otome
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...then you might like
Glass no Kamen
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Lots of striking parallels where you can tell Mai-Otome was heavily inspired by Glass no Kamen. There's plenty of differences to enjoy as well, and they're both great series so give either one a go if you haven't already.