Robert (the hero), a prince of the Kingdom of Corinth.
Alieno (heroine), the only daughter of a farmer in his territory, and promised to enroll her in a military academy in two years.
However, shortly after making that promise, Alieno goes missing.
Two years later, when Robert went to the academy, he found Arieno waiting for him there in the position of a squire.
Why did Arieno suddenly disappear and what happened during those two years?
Robert learns of these questions through his assignments at the military academy.