 If you liked
Shoujo Kakumei Utena
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 ...then you might like
Odd Taxi
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Both start as a simple slice of life-ish story that slowly turns more and more complex and darker, in where the main character unvoluntarily gets involved in a serious conspiracy plot. Both have subplots and episodes entirely dedicated to a character that contributes in the story, also, they have an ensemble cast. The most noticeable similarity though is how the mystery develops slowly in both.