Hi! At the end of last year I was reading a story where people from noble families from specific territories could use different type of something similar to magic (water types, fire types, wind types and some other last type I think) to fight for they teritories.

The MC in the story was a FL with probably long silver hair who was from a family that could use water or fire magic (definetly one of these) but was too weak in the eyes of her family (they were not a good family to her). She got in a marriage contract (fake one, for a 1 year I think) with a heir of the other magic type family (if FL could use water magic, then ML were using fire magic, if FL was using fire, then ML were using water - I just don't remember which one used which).

FL wanted to use the contract time to prepare herself to live comfortably alone in the future. It turned out later thay FL wasn't that weak as her family thought and when ML territory was attacked by some monsters she was the one who helped and defeated them. She then was started to be treated as a real part of ML family, everyone in ML's territory respected her, but the contract was still going.

It was a story with colored pages (some kind of weebton?), I think it was either isekai or FL regressed in her own body again, as she definetly had some memories from her first living this life that she used to help ML territory with. As for the time the story was in, it was supposed to be like the aristocratic time with swords and magic (I know, most stories like that are like these).

I don't rememeber much more, there is also a chance that FL had different hair color. Does anyone might help me find this story? I would really appreciate it!

Her hair is black, but maybe I Was the Real Head of the House?

Thank you so much, I think it might be that story! I didn't find the chapter with the fight I mentioned yet, but I read a few first chapters at it does seems like the story I'm looking for. And as I thought, I have mixed up FL hair color :( Thank you for your amazing help, I really appreciate it!

No problem, glad I could help!