Binbou Kishi ni Yomeiri shita Hazu ga!? Yajin Reijou wa Koutaishihi ni Nattemo Ryuu wo Karitai

The esteemed daughter of the Caliente Marquis family, Ralphine, grew up almost unconnected to noble life as a tomb boy with an outstanding athletic ability. She was raised almost like a commoner away from the capital as raising a noble daughter is quite expensive and her parents already had her 5 brothers and 5 sisters to provide for. Ral became a great huntress, able to take out even a red bear, and earned the nickname "wild daughter" from the village children. Right before her 13th birthday, her poor but loving parents take her to the capital for her coming-of-age ceremony and introduction to aristocratic society. There, she befriends the Imperial Palace Knight, Selmianne, who turns out to actually be a hidden child of the current emperor !? https://www.cmoa.jp/title/305173/