Information (Update)

Y/n L/n and Yuu L/n are both siblings and have a tailed beast inside them. Yuu L/n has the two tail cat name Matatabi she is always traning trying to control her power and her tailed beast without going out of control. Y/n L/n has the nine tail fox inside of him name Kurama when every he try to train with his tailed beast power he will always go out of control, good thing his sister is there to stop him. One day they encounter a red hair devil name Rias gremory and ask them to join her peerage will they accept it or not. Read this story and find out