Utsukushihime ~Mahou Choukyou Monogatari~

The evil "Madou Empire" has beaten the last remaining country, "Grandis Kanan." As Leno sits in the ruins of the palace savoring this great victory, he uncovers a plot to kill him. Princess Farina of the fallen kingdom is behind this scheme. The emperor of the Madou Empire is impressed with the resistant and hostile attitude of this princess and orders Leno to train her as a sex slave, worthy of the emperor.