“This was supposed to be a loveless, business-like contract marriage—or so I thought.” Arelila, whose engagement was broken off and who has passed the appropriate age for marriage, is secretly called “the noble spinster.” Currently, she works diligently as the right-hand woman of “the cold-hearted Prime Minister,” Duke Eysteria Wegmund. One day, while on duty, Eysteria proposes to her. Although rumors suggest that the Prime Minister is romantically involved with another woman, and given Arelila’s low social status and position as an old administrative officer, she assumes it to be a contract marriage and agrees to the engagement. Thus begins her business-like newlywed life with the cold-hearted Prime Minister… or does it!?