 If you liked
Mail
|
 ...then you might like
Mononoke
|
Both have an unusual, mysterious protagonist with supernatural abilities who travels in order to find and help those plagued by otherworldly troubles. Mononoke deals with a single case (although the anime it's adapted from has a wider variety of incidents) whereas Mail has a case per chapter and Mononoke is more of an eerie brand of supernatural fantasy while Mail is straight-up horror, but if you like series with freelance supernatural detectives, both have you covered.
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Recommended by lithiumflower