>>283231737
Two things work against anime being scary.

First is the art style, which creates a disconnect and sense of distance. This is specifically an ANIME problem, not a manga one, as you can have things that look properly gross or creepy in manga but once it gets an anime adaptation the magic is lost. See Meiruko Chan manga vs anime, there is something lost in the designs between the two. A sense of malice in the manga that isn't there in the anime even for those same spirits. I believe that it is a combination of the anime designs being lower detail to be more easily animated, and the fact that in manga your brain has to fill in more details to imagine how the scene plays out, so the horror vibes prime your brain to imagine whats happening on page as scarier than it really is. Whereas, in anime, you brain doesn't have to fill anything in.
Essentially, your mental image of a vampire is always going to be scarier than an actual image of a vampire.

The second is the episodic nature of anime. Those horror vibes? They don't turn on and off like a switch. To properly engage with horror, you need to be lulled into that headspace. Short, 22 minute episodes have trouble doing this because by the time your brain as immersed itself into the story you are basically already having to wrap up the episode. Horror movies work because they have the runtime to ease you into it before things get spooky, but an anime episode doesn't have that luxury. The start/stop nature of it being broken up by OP and EDs, even when binge watching, breaks the flow. Whereas, again, a manga once you have the ability to sit down and read it is able to flow from one chapter to another nearly seamlessly and you don't lose momentum.