 If you liked
Gegege no Kitarou (1968)
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 ...then you might like
Dororo to Hyakkimaru
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both of these series were made at the very end of the classic black and white era of anime (dororo to hyakkimaru was actually the last one made in black and white) - both are atmospheric, ahead of their time, and have dark themes including demons and yokai - both were originally from grandmasters of manga (dororo by osamu tezuka and gegege no kitaro by shigeru mizuki) - and both are great!