 If you liked
Ga-Rei: Zero
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 ...then you might like
Darker than Black: Kuro no Keiyakusha Gaiden
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At first, both these animes have a similar drama component: in order to do their duty main characters have to kill their loved ones, however in Ga-Rei Zero drama is payed more atention to and is more deep than in DTB. Both these series deal with organisations exterminating threats to the mankind (ghosts in GRZ case and contractors in DTB case). Sure thing there are mystical powers and supernatural abilities included. Also, you will feel painfully sorry for main characters whichever you watch.
In case you watched DTB only because of action and fights, it's unlikely you will like GRZ. There is action (actually,
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