 If you liked
Tasogare Otome x Amnesia
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 ...then you might like
Shinsekai yori
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The art and the atmosphere are both similar, especially at the beginning of each. There's mystery and very mild horror used to create the beginning perspective. They both start slowly; increasing in action pace about halfway. There's also romance in each (though less of a plot basis for Shinsekai Yori).
At the beginning of Shinsekai Yori, my mind SCREAMED Dusk Maiden of Amnesia due to the art and pace, however I truly believe Shinsekai Yori is more artful, deeper and a bit more fluid.