Duchess in the Attic (Manga) Volume 4 by Mori

Though Opal is horrified by Hubert’s rash purchase of the infamous Manthest land, its fortunes fare better than feared thanks to Marquis Roussel, an investor from the neighboring nation. But Opal’s relief is short-lived, as her world is turned upside down once more when Hubert suddenly confesses his love and says that he wants them to be a true couple! Will she accept his advances? Or will the sudden return of her childhood best friend alter her life’s course yet again?