I Want to Be a Mage, but I'm the Strongest Knight

Ever since we were kids, my younger sister was trained to become the strongest mage, while I was trained to become the strongest knight. But when we grew up, we discovered that I seemed to prefer casting spells, while my sister preferred hacking people apart. So now that we're leaving home to go to school, of course we'll switch roles~ But here's the problem: I'm going to an all-girls' school, and that's going to be awkward... (If you enjoy this book, please consider adding it to your favorites. Thank you!)