 If you liked
Kuro Hakushaku wa Hoshi wo Mederu
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 ...then you might like
Niehime to Kemono no Ou
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- Supernatural (though switched where Esther is magical in Kuro vs Leo in Niehime)
- Protagonist (Salphie + Esther) wants to save/help her partner
- Both seem cinderella-esque where they're coming from a poor background being saved by a richer person (In Niehime it is the king, in Kuro he's an earl)