Exile ~Blood Royal 2~

Main character is the prince of a certain country. He is cursed by a witch and is destined to become a devil when becoming 20 years old. The king confined him to a small island castle to live till becoming a beast. According to a fortune telling, prince must be sincerely loved to prevent turning into a demon, but no woman could love the cruel prince. Then one day two princesses arrive as a tribute to the kingdom. Prince entrusted the last hope to these two princesses ...