If you liked
Durarara!!
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...then you might like
Kubikiri Cycle: Aoiro Savant to Zaregotozukai
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In both series, we have many characters that are all related to each other.
Moreover the characters are mysterious and seem to hide a secret. (Boku and Kunagisa in Kubikiri Cycle and Mikado, Masaomi and Anri in Durarara !!)
These are action series with the supernatural but very focused on the dialogue and narration.