A Royal Princess With Black Hair tells the story of Crown Prince Karyuel and the neighboring Princess of Yurisien country marrying each other, but all they dream of is getting divorced as soon as possible! Not only that, the people around them also planned a scheme to separate them. However, because they had gone through all the obstacles, they were slowly attracted to each other, unlike how they first met. . Will the immature princess and crown prince go for divorce as they first wanted? Or … will they still have their marriage?