Duchess in the Attic (Manga) Volume 2 by Mori

After successfully finding the culprit behind the duchy’s embezzlement, Opal returns to the capital to expose the truth. However, the temperamental Duke Hubert refuses to listen, leaving her ostracized again. Realizing that playing nice won’t help, Opal decides it’s finally time to go on the offensive. She draws up a plan of action to turn the tables on her ignorant husband and the mansion’s insolent staff. Opal’s brilliant counterattack begins at last!