Futsugyou: Dansou Majutsushi to Kin no Kishi
払暁 男装魔術師と金の騎士
A female magician, Halka, disguises herself as a man and uses healing magic to save a dying knight on the battlefield. After using her own life force to heal him, Halka wakes to find the knight offering her a reward for winning a bet. He then compels her into forming a master-servant contract with him.
