 If you liked
Shinkyoku Soukai Polyphonica
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 ...then you might like
Yozakura Quartet
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Both anime are set in alternative version of present day world. Unlike in reality, supernatural beings are common in both titles. In Yozakura Quartet we have a city that is a refuge for youkai, in Polyphonica a city when humans and spirits live together. Both also have similar theme of office dealing with the supernatural denizens of the cities as the main theme.