Yurie Sigtuna is the female protagonist of the Absolute Duo series. She is a from forgein country in europe as well as a princess.Her Blaze is a Sword Type known as Twin Blades (Tsuinburēdo) the reason she came the Japan and Kouryou Academy is because she wants to get stronger to Avenge her fathers death, because of this she seeks out Tooru for help and to teach her his Final Move.

(Source: Absolute Duo Wikia)