 If you liked
Night Walker: Mayonaka no Tantei
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 ...then you might like
Mnemosyne: Mnemosyne no Musume-tachi
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Both Mnemosyne and Nightwalker feature:
A Private Investigator who's lived longer than ordinary humans (Rin, Shido)
A rather cute assistant who's sweet on the P.I. (Mimi, Riho)
An antagonist who wants the P.I. for his own by any means (Apos, Cain)
Both protagonists are immortal detectives and they chase supernatural creatures at night.
Both are spooky and dark broody stories with grim atmospheres to them as well as quite a bit of action and also supernatural focus as well too and also nice art and character designs as well too and good elements of suspense.
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Recommended by Disapeared_Ghost