I would really recommend https://www.mangago.zone/read-manga/koisuru_psycho_no_shirayuki_kun/
Even thought it’s pretty short and ongoing it is super cute and I think what you’re looking for! ヾ(☆▽☆)
Azure and Claude
Three Days of Happiness
Watashitachi no Shiawase na Jikan
My Reason to Die (Rather than creepy, it has unsettling vibes)
Ohayou, Ibarahime
Usemono Yado (the characters are adults/older side)
Flawless(this a long one)
Winter Woods (the characters are adults/older side)
Iris Zero (don't think this is creepy, but it's a genre that you're after) This one is similar to OreGairu if that's what you like
need some psychological romance that gives me the chills. some of my favorites are "i love amy" and "i want to hold aono-kun so badly i could die". gl and straight recs r okay but please no bl sorry