Suggest your best unbeatable masterpiece to read!

Hi!
I'm making a Mangas/Manwhas/Manhuas/Webcomics/etc. list for a newbie friend at the moment, and I would really appreciate some suggestions!

They are NOT interested in:
-GL/BL
-Comedy
-Stories focused on romance

They ARE wishing to read:
-Horror
-Psychological
-Josei/Seinen
-Don't want artstyle too 'busy'
(This is kinda random and not the genres they asked me to, but they really liked Fruit Basket when they were younger...but again, it's the only manga they ever read so maybe it was the novelty lol)

Any help is super appreciated!
I only have very classic suggestion for now...like Higurashi, Junji Ito works, Bersek, Death Note, Otasumi Punpun, Nana...etc., so I'm a bit in a pickle haha.

Thanks! Have a wonderful day~