They're more detailed and have collar bones and nails. Many changes were made to the student models.
I can add more mature stuff and avoid the controversy and 'creepiness' of the characters being highschool students. There are several reasons why I went ahead with this idea, one of them being that the characters would be older. A daigaku is a general term for an academy that comes after highschool. The pros and cons of this change was discussed a lot in the Discord Server. The name of the game was changed from 'Koukou Gurashi' to 'Daigaku Gurashi' since I no longer wanted the game to take place at a highschool.