Seirei Gensouki: Spirit Chronicles Volume 18

After a tense verbal standoff, Liselotte Cretia of the Galarc Kingdom is abducted by the sixth hero, the self-proclaimed Saint Erica. With the king's permission, Rio sets off to save her--with the help of her head attendant, Aria. Meanwhile, while in captivity, Liselotte witnesses the current state of the remote nation of the Holy Democratic Republic of Erica with her own eyes.

Just who is Saint Erica trying to get revenge on?