 If you liked
Spiral: Suiri no Kizuna
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 ...then you might like
Shinrei Tantei Yakumo
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The theme of detective fiction comes to play in both of these series. Also, the main protagonist is intelligent has an aid there to help them when in need (the main heroine). Additionally, there is a psychological thriller like feeling in some of the cases that gives the viewer the question of doubt. Drama and small hints of romance are also present.