Sensei Yosa first appears in The Way of the Warrior. She teaches the samurai students at the Niten Ichi Ryu the art of the bow; her star pupil being Akiko, who develops a rivalry with Emi in that form of combat. She would present her bow and arrows to the former at the end of the book.
Sensei Yosa is tall and graceful, yet with a hint of steel due to her skill with the bow, deadly and graceful like a hawk. She also bears a long scar on the side of her face.
After the Battle of Osaka
Captured, not dead. presumed to have survived after Kamakura dies.