Futsugyou: Dansou Majutsushi to Kin no Kishi

Synopsis

“Do you wanna make a bet?” Halka, a female magician pretending to be a man, saved a knight who was dying on the battlefield. When Halka, who had chipped away at her own life to use healing magic, awoke, the beautiful knight whom she saved said, “I want you to accept this as proof of winning our bet,” and forced her to enter a master-servant contract with him……!?