Seirei Gensouki: Spirit Chronicles: Novel Omnibus Volume 10 was written by Yuri Kitayama and illustrated by Riv and contains volumes 19-20 of the light novel series.

As soon as Rio leaves the kingdom to rescue Liselotte, Reiss and the bloodthirsty Heavenly Lions take the opportunity to strike Galarc Castle. The girls left behind put up a fight—both to prove themselves and to survive. Meanwhile, Rio faces a fight of his own against Saint Erica. Can he return in time to save his friends from the imminent threats, not to mention the ones lurking just around the corner?