How else are we expected to believe that parents are not getting their kids out of this school ASAP? Not every single of the boys and girls is an orphan or a street urchin, huh?
Let's not forget that the owner of the MegaCorp financing the school is said to be perfectly willing and able to destroy the lives of anyone who won't go along with his plans.
A single phone call to the police or whatever Japan calls their equivalent of the FBI would have a serious investigation called in, MegaCorp or no. The school would be shut down, and the CEO would be put on trial for unethical experimentation, and even if he won, it wouldn't be a stretch to think the girl's families or a Screw the Rules, I'm Doing What's Right! type might lynch him.
And the CEO has friends, family and connections who would make the girls regret their parents tried to sue the school, and the families involved was willing to sacrificed the happiness of their children if it meant a promising future.
