Busaneko ni Kaerareta Kiyowa Reijou desu ga, Saikyou no Gunjin Koushaku ni Hirowarete Kizetsu Sunzen desu (Associated Names)

Marie, a plump and timid yet dull viscount’s daughter, has always lived in the shadows of her beautiful half-sister, who was constantly under the spotlight. Her only source of pride is her engagement to Prince Maxim. However, one day when she was eighteen, Prince Maxim suddenly breaks off their engagement. He had fallen in love…