Lily Koku Kishidan to Cinderella no Yumine

Three hundred years have passed since "combat competitions" replaced "war" as the destiny of nations. Nina, considered a "failure," has her talent for archery discovered and becomes a member of the Lillie Kingdom Knights. At the annual Western Region Cup, Nina encounters a female knight suffering from the after-effects of an injury. In their first match, Licht sacrifices his own victory to protect Nina. Nina, however, struggles with the desire to be an equal knight, rather than just being protected... (Source: Shueisha, translated)

https://www.cmoa.jp/title/293684/