After being lent out to Supreme Commander Yamashiro, Yuuki demonstrates an uncontrollable new slave form boasting overwhelming strength. However, such power always comes with a price-in the form of an equally tantalizing reward! And as Yuuki brings the mightiest being on earth to heel, the scions of the Azuma clan gather to decide their next leader in a winner-takes-all tournament. Will Himari fifinally prove to her family that she's not the runt of the litter?