First manga that comes to mind is +Anima. I'm honestly surprised no one has picked it up to make an anime adaptation of it yet. It would definately do well for younger audiences but I can see older viewers getting a lot from it too.
Mononoke, a horror anime with a unique art style and very interesting stories (I believe 5 in total). I think it really doesn't help that it has a similar name to Princess Mononoke so people might confuse it with the Ghibli film whenever they hear the name.
I've seen Mononoke! Jealous of the Anime Man's statue he shows off in his vids.
Niice. Did you watch Ayakashi: Japanese Classic Horror as well? The last story in Mononoke is basically a retelling (with some changes including the time period) of the last story "Bakeneko" in Ayakashi.
Shiga Hime and Shadow House
both are great and i recommend both
Bio Meat Nectar.
I'm surprised this is not an anime yet after the rise of Terraformars and Parasyte.
It's about a girl trying to get together with a guy from her school. I've fallen behind reading this thanks to online classes :(
Many manga I have read haven’t been translated into English~
disastrous life of saiki k