Distol vows to become the world's greatest swordsman after his mother's sudden death leaves him devastated. Years later, fresh sorrow arrives when his sister is chosen as the Holy Maiden destined to seal away a demon king at the cost of her life. Refusing to accept another loss, he meets a enigmatic witch who offers him extraordinary strength if he agrees to invade a neighboring nation, claim its treasure, and bring back its princess. With this dark bargain, Distol's path takes a fateful turn.