 If you liked
Sugar Dark: Umerareta Yami to Shoujo
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 ...then you might like
Kamisama no Inai Nichiyoubi
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Grave Keepers; Burial; Twists and turns on being mortal and being human; Looking for manga with an interesting premise based on these? Titles that are different enough from your typical school romcoms?
These two manga share all these plus their own interesting fantasy setting; far removed from any school if you're already sick of those. There is an air of mystery about the world in both stories, containing secrets that the protagonists come to find out. The female main character in both possess a degree of naivety but are not what they seem.
One is certainly darker than the other, but certain themes and abilities will
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