Mori 
Duchess in the Attic (Manga) Volume 5 [EPUB ebook] 

Now that Opal and Claude are finally engaged, they decide to leave their home nation behind to move to the Taisei Kingdom, where Claude has earned himself the rank of marquis and the friendship of King Alessandro. However, not everyone welcomes Opal with open arms-the temperamental Baron Pradeaux openly loathes her, and even the king seems to harbor suspicions. Opal was prepared to leave high society and retire, but she finds herself once again forced to take center stage and rejoin the subtle battle of political intrigue.