Of course, there was plenty of lady-led light novel adaptations to go around. This is probably one of the few that didn't involve reincarnations or villainesses, although that doesn't make any better than the rest.
DUCHESS IN THE ATTIC (Yane Urabeya no Koshaku Fujin), based on the light novels by Mori and character designs by Huyuko Aoi, with art by Maki Hayashi. First published in 2019 and first published in North America in 2024.
PLOT:
Opal dreamed of having a beautiful wedding as a child, but her chances were ruined forever thanks to one man getting fresh with her during her debut. Now all of the other nobles presume she's a harlot, and she's forced to marry a duke who covets her fortune and only cares for his sickly mistress. Opal knows where she's not wanted, so she moves herself to the attic to bide her time, review her husband's ledgers, and find a way to get herself out of this mess..