Before I say anything else, the models and textures for the girls were not made by me!
The hair models and face textures were made by NoicePotato:
https://www.deviantart.com/itsnoicepotato/art/Yandere-Simulator-Kakegurui-Models-DL-IN-DESC-811367586

The uniform texture was made byfaytekina:
https://www.deviantart.com/faytekina/art/Yumeko-Jabami-696222395

I used Unity to add them to the game, I might make a tutorial on it if people ask for it. Also, all I did was replace 4 of the girls already in the game. The only thing I modified out of their appearance was changing Yumeko's persona to a social butterfly because I thought it would fit her better. Besides that, their classrooms and schedules are the same!
Also, their hair do have physics! I accidentally turned off all hair physics in my settings though, sorry :')