today I give you TWO spoopy recs.
the morose mononokean and kemono jihen feel like brothers to me.
the former is a heartwarming comedy about a pair of boys who exorcize demons.
the latter is a Shonen action series about an agency full of monsters who help take care of problems relating to other monsters.
both have elements of mystery and horror.

I recommend the manga for both, but kemono jihen's anime is also great.