 If you liked
Occultic;Nine
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 ...then you might like
Hakata Tonkotsu Ramens
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Even if Occultic;nine does not include explicit killers (well just the albino kid), there is a mysterious atmosphere in both shows. In addition, the killing part is present, on Hakata is explicit Killers doing a job and getting paid while on Occultic;nine we have the 'occult' with black magic and other resources.
Of course, reasons behind deaths were money, ambition, or killing just for fun in both shows