So there is this guy in the castle modeling club at his school that runs happens across a blonde girl who is rumored to be a slut. One day on the way home, she bumps into him and his prized castle falls to the ground crushed. She was running away from a marriage interview and the guy helps her get away from her family in exchange for her help rebuilding the castle. They then have to live together after it was told to her family that she liked him.

I totally forgot the name of this manga and I don't have high hopes for anyone else remembering it because it was only a few chapters released several months ago, but if you do remember it please post!

Ume Shigure. I believe this is the one you're looking for.

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Yes! That's exactly it! Thank you!

Wow, I was looking at the wrong end of the alphabet.