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!