Seirei Gensouki: Spirit Chronicles Volume 15

A appetite for revenge that has lasted a lifetime is finally sated. After crushing Lucius with his own two hands, Rio takes responsibility for protecting the royal siblings—until an unexpected visitor makes an appearance.
“I'm more interested in you than the two princesses.”
What will Rio do?
Meanwhile, with no news of the whereabouts of his fiancée, Flora, Sakata has his eyes on Liselotte to become his third wife. What will the result of a marriage interview between two prominent kingdoms be?