I'm a big Junji Ito fan, but I haven't really found any good anime that come close to matching the creepiness of his manga stories, including that one Junji Ito anime series that's out there. I think the closest I've seen is Mononoke, though honestly I haven't seen a ton of anime, so maybe I'm missing something. I thought I'd ask to see what you all might suggest in terms of genuinely creepy/unsettling/dark anime movies or series, either similar to Ito's stuff or whatever else you think is good.
Any suggestions?
Or read the manga! Though it becomes something completely different after the end point of season 1, it's still good. But seconding the advice to pretend season 2 doesn't exist, it's really bad.