 If you liked
Tasogare Otome x Amnesia
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 ...then you might like
Okujou-hime
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In some way, these two series reminds me one and the other.
Both manga takes place at a school setting where there is an elegant but strange girl who roams around at school. They also like to often hang out around the school rooftop on the lookout for various things.
Both series has some mysteries as well as comedy, drama, and romance.
Both series has a similar feeling that I found to be at times lighthearted, other times dramatic with a melancholic with of presenting its plot.