Alexandrite Knight

A young girl named Kikka loses her memory and is wandering alone when she is rescued by Princess Gina of the great nation of Alexandrite. As Kikka grows up under Gina’s care, she becomes an exceptionally powerful knight — devoting her formidable strength solely to protecting Gina. However, complications arise when a suitor steps forward to propose marriage to Princess Gina. Turmoil, loyalty, duty, and romance all unfold in a fantasy world full of knights, royalty, and political subtlety. https://www.cmoa.jp/title/318297/