At the earnest request of the boss and his wife, Chen Yu finally agreed to let Minami stay.
Regarding Minami's identity, as her original identity was already being used by the mother possessing her body, it was necessary to provide her with a new one.
However, thanks to Japan not having an identity card system, forging an identity wasn't too troublesome, especially since Minami, as a soul entity, neither needed to see a doctor nor to buy social security, which saved her a lot of trouble.
In the end, after discussing with Chen Yu and the boss, her identity was changed to a distant relative of the boss, living with him as his niece.