Looking for a manga were the mc could (not necessary) have some power but does not know of a wider supernatural world but is dragged into it due to some event/promise/ pretty much any reason.

Read Shiranui-san wa Oni ga Mienai and would love if there is something similar. The story is about a guy who has supernatural talent and is asked to marry someone to bind him to their group (there is a bit more but this part interested me the most) after he is "discovered".

Strange and Beautiful fits that description. The female lead and mutliple others are taken into the supernatural world because one of them is supposedly the next wife of the goblin king. It’s ongoing but already has 58 translated chapters out. I have really enjoyed it so far.

Kamisama Kiss half fits the description. It’s about a girl whose father abandons her, and she gets evicted from her home. She runs into the god of a shrine who gives her his powers and lets the shrine be her new home. After that she has to deal with the supernatural, but she’s in the human world for parts of the manga and in the supernatural world for other parts. It’s not just the supernatural world.

Kochou no Yumeji fits the description too.