Alright, let's escape.

I had a dream. A "me" born as a noble in a water kingdom. A dream where "me," without even the ability to manipulate water, is exiled from the country by the Crown Prince, who was my sister's fiancé, as punishment for bullying my sister. And from that shock, my sister, who gained the ability to manipulate all water, married the Crown Prince as the country's saintess and lived happily ever after... So I made a decision. Well, let's run away! In the country I fled to, I tell that country's prince the reason why I ran away.