Emma is the adoptive daughter of Dogen, the man who made the Shinobi Prosthetic. Emma was orphaned as a child and was starving, but a Shinobi named Orangutan gave her a rice ball and saved her. She lived with him for a time until being adopted by Dogen, a doctor and close friend of Isshin Ashina whom Orangutan met when Isshin cut off his left arm, preventing him from becoming Shura. Emma learned the way of the sword from Isshin Ashina with the desire of being able to kill Shura, should her friend Orangutan ever lose control of himself again. In the Shura ending Emma tries to stop Sekiro and fails, triggering the final fight with an aging Isshin Ashina.