Hart's Fortune!

In this story a girl of 6 years old fights along side her little brother to avenge her parents death at the hands of her uncle. Her journey is to learn more about this phenomenon called "Margin Power" and use it to fight her uncle in a magic showdown. But the only problem is she has 4 years in order to prepare for the battle and so as the saying goes, "Practice makes perfect" she must practice this magic in order to defeat her enemy!