Narnia was Elizabeth (the mage) bodyguard and her friend since childhood. She was also part of her adventurer team "Battleaxe of Daybreak". But after a major event (some kind of invasion?), the leader of that team called Orba lost his limb, and the team going to retire. Also, it seems that Narnia and Orba have a relationship going on. Later after the battle, Elizabeth want to go with Masaru and want to free Narnia from being her bodyguard so (kinda forget here, in ch. 20ish) Narnia can pursue her dream and future with Orba. Narnia can't just accept this, and duel with Masaru to prove he can protect Eli. In the end, he won and after the (emotional) parting words, they left on good terms and Narnia seems to wed Orba. Aaand now we just found out she's been kidnapped, it seems.