Migawari no Ikenie datta Hazu no Watashi, Kyouken Ouji no Ai ni Konwaku Chuu

https://www.cmoa.jp/title/299909/
“I never thought a day would come when I’d find someone this dear to my heart.” Nadia, a count’s daughter, has spent her days in misery, abused by her stepmother and half-sister. One day, she is ordered to serve in place of her sister as an attendant to Prince Clovis, the second prince—feared as the “Mad Dog.” Assigned to work under Clovis, who is rumored to be arrogant and cold-hearted, Nadia is filled with anxiety at first. But little by little, she begins to glimpse the warmth hidden beneath his harsh demeanor… Will the young lady who was never loved by her family be able to turn this crisis into an opportunity through her own strength? A Cinderella-like story where she’s doted on so much she might just melt!