 If you liked
Hyouka
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 ...then you might like
Psycho-Pass
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In both shows main characters solve problems and look for clues to solve mystery cases. Hyouka is funny and kinda romantic, Psycho-pass is more about solving murder cases. Both got one quiet cool character (Oreki in one, Shinya in the other) who is great in getting all the clues together and always solve the case.