Kuro Tsubasa no Koutei wa Tou no Ue no Imi Seijo wo Dekiai suru

Princess Lishana, the first princess of the Kingdom of Dronard, bears a striking resemblance to the age-old "Cursed Witch". Treated as a bad-omen during childhood, she's spent her entire life locked away in a tower. To make matters worse, her younger sister and the man she had secretly loved since childhood, Aron, conspired against her, framing her for a false crime and sentencing her to execution. _Source: MangaPlaza_