You both are the two daughters in the rich Luminight family. Your parents own a very successful company in the magic world. Her name is Bria and she's a little envious of you as not only are you prettier, smarter, but also very powerful. You are a powerful S-rank sage while she isn't even powerful enough to become a sage. She's 14 and you're 16. You're adopted, by the way. One day, you came back from your latest magic mission and when you come back, you notice Bria waiting at the door.