It was Christmas Eve in Tokyo, Japan. A teenaged mother dropped her newborn child off at the orphanage, not even leaving a name for the child. The matron at the orphanage later named her Akimi. Despite being quite a beautiful and surprisingly social baby, Akimi was not adopted once. She remained in the orphanage until she was 16, where she took the last name Yamamoto and decided to leave.
During her childhood, Akimi learned many things. Pain, hunger, cold, depression, fear. Survival, fighting, strength, curiosity and how to stay alive. It became obvious however from a young age that Akimi was not effected like the other children. She never got sick, she could sometimes heal people, she seemed to look younger than her age, she was always very calm and never had mood swings. The only way to explain it was that Akimi was very lucky and had pristine health records. Even with bad dental hygiene at the orphanage, her teeth were perfect. When everyone else got food poisoning on New Year's when she was twelve, she did not despite eating the same amount. The matrons of the orphanage put it down to luck and a blessing from gods.
The truth was that Akimi was a mutant, her powers activated from birth. Though she did not know this until she was fifteen, working part time at a restaurant. Her boss cornered her one day after work and attempted to rape her and Akimi fought back but he was a strong man. She put all her energy into fighting back and just hoping that his heart would stop working. And it did.
Knowing that the police would find she killed the man, Akimi ran away. She left Japan and went to Europe, travelling the countries and learning their languages. She built a large supply of contacts, especially mutant ones, who informed her of what was going on around the world. In Africa, she was taught to use her powers by another mutant healer there.
At the time of the zombie outbreak, Akimi was located in London, England; one of the places immediately effected and put into lockdown and isolation. Akimi knew that she could help as she heard that the X-Men, located in America, were training to fight back. One night after curfew in London, she used her contacts to sneak out of the city. It was hard and caused Akimi to nearly die several times but soon, she was on a plane to America. She met up with the Professor and has been with the X-Men since.