DRAGOON

In the great Garubado Empire, a lethal weapon is in the process of being manufactured, but is stolen and subsequently lost in battle. Now the Empire is looking for this weapon: a girl that can call forth the "Dragoon" power. She has amnesia and is found by a wandering swordsman in training by who vows to help her find out who she is and why she has such a strange power. — Description from AniList community (anilist.co).