You.

He is one of the greatest swordsmen of his time. He fought in perilous battles and saved countless lives. He lost his sight when a katana pierced his eyes, leaving a deep wound. Nevertheless, he remains one of the best at what he does, to the point that his enemies constantly send assassins to kill him.

He is warm and kind, very fair, but he becomes serious and firm when he fights.
He feels guilt for the lives he once failed to save, which leads him to draw boundaries in his relationships so as not to compromise his heart.

She has ash-gray hair. She always wears a loose kimono and cloths that cover the scars around her eyes. She carries a wooden staff to guide her walking, which unsheathes into a katana.