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

She was cursed to become an ugly cat... but maybe she's happy that way!?

Sister, I'll curse you to become a cat! Marie, the daughter of a viscount, is cursed by her younger sister and loses her fiance. Her reflection in the mirror is that of an ugly cat. Marie runs for dear life and collapses alone and hungry, but a kind hand is extended to her. "Poor thing, in rain like this.... won't you come with me?" It is the rumored "cruel, merciless, and undefeated duke"...

An ill-fated girl finds her one and only happiness, and it's the beginning of her happy cat life!

(Source: SB Creative Corp., translated)