DESCRIPTION
Yui was so violent that the rehabilitation program run by the daycare center attached to her school was not able to handle her. A child like this appears once every few years, so the center has a way of dealing with it. That is to outsource regression education to a professional. It costs money, but it is guaranteed to regress.
Q. Why not just hire a professional at the center?
A. If we leave it to the professionals, they will regress (destroy the mind) to the point where they will be unable to return to society, so it will no longer be a rehabilitation program.