Responses
http://www.mangago.me/read-manga/no_doubt_in_us/
although I don't think it's this
Suddenly became a princess??
The story is about a young girl who is (apparently) practicing to be a princess. There is a black haired boy who helps her. I think at first they don't get along. The only chapter I remember is when the young princess throws herself into a lake to retrieve a hand fan and return it to the boy. Some help?