Dr. Misami, that name carries just as much weight as the Chimera and Nue King. She is a renowned scientist known for developing technology that was thought to be impossible.
Small electronics like cameras, communicating devices, drones, and other small things of that nature are her specialty. Dr. Misami only creates things she wants and refuses to take requests from anyone including the kings. Weapons are especially banned for her.
There isn't a human alive that knows what she looks like or how old she is. Dr. Misami is very mysterious and uses an android as a proxy. Even the kings do not know what she looks like or where she lives, but they are the only people with a way of contacting her. In order for her to stay neutral, she gives the kings inventions that no one else can get their hands on.
Everyone in Japan praises her as a God for her inventions, they have made life much easier for the people living in both territories of Japan. Normally, a person would have to choose allegiance to one faction, but she is a different story. Her accomplishments allow her to be a neutral party and go between both sides.
A proposal that would change the way Japan interacts with the entire world was made to the previous kings. Almost instantly it was approved. There is only one person who has the kind of influence to pull off something like that and that would be Dr. Misami. She requested they put up barriers around Japan to deny access to the rest of the world. Her reasoning was so that no one would take her inventions and alter them in a way that could be weaponized.
Even with the succession of the new kings those rules still apply. They prefer to have whatever happens in Japan stay in Japan. Even before they took rule they both knew a civil war was imminent, so this played right into their hands. It's better if the rest of the world didn't know what was going on inside Japan. Dr. Misami may have even known the "Edo Civil War" might happen and that played a part in making her proposal.
She truly is an all-knowing and all-powerful GOD….