365 Days to the Wedding Vol. 2 (manga)

Oohara Takuya and Honjouji Rika’s fake engagement plan seems to have fooled their co-workers—perhaps a bit too well! But they’re in hot water yet again when Takuya’s father appears at their workplace wondering why they hadn’t been given a heads-up to start preparing for the wedding. But before they can decide whether to reveal their lie or not, Oohara is strapped with an assignment of royal importance! Can the two of them survive the pressures of work, marriage, and now family?