Seirei Gensouki: Spirit Chronicles Volume 20

After emerging victorious from his harrowing battle with Saint Erica, Rio returns to the Galarc Castle amidst the threat from the Beast of the Land and a raid on his mansion! As a result of conspiring circumstances, King Francois personally entrusts Rio to investigate Satsuki's abilities and become her mentor. Meanwhile, the Saint wastes no time planning her next invasion. . . "This is my crusade! You have no right to stop me!"
Anger, grief, and despair culminate in the climax of the Saint Arc!