how do i get the 3 girls to follow me?
You need to talk to the girls a fist time, then turn on the radio and talk to the black hair girl until the dialogue is " We're soon going to go home " or something like that, then you have to not read the diary of the ponytail girl and give her back the key after you took the curtains, talk to the black hair girl again then sit next to the quiet girl :)