Busa Neko ni Kaerareta Kiyowa Reijou desu ga, Saikyou no Gunjin Koushaku ni Hirowarete Kizetsu Sunzen desu

Cursed to be an ugly cat--but maybe you're happy! "I'll have you turn into a cat, sister." Marie, the viscount's young daughter, lost her fiancé to her younger sister Emilia and has been cursed even more. Her reflection in the mirror - an ugly cat! Running away from her sister for her life, Marie, who escaped from their house, collapsed from loneliness and hunger, unable to speak. Then, a kind hand reaches out to her, "In the middle of this rain, poor thing...Would you like to come with me?" The figure is the "ruthless, merciless, undefeated duke" rumored even in social circles. An unfortunate girl gets her one and only happiness, and a happy cat life begins!