The other 3 scenes are for Aurora, Seraphina and Roxy. You can get Seraphina's scene + one of the other 2 in the same run
Seraphina:You need to buy the pin for her, and learn everything about her using the USB before the 9th night. (You'll need 2 passwords so talk to her whenever you can or just copy it)
Aurora: Learn about her using the USB and talk with the AI until you make a bridge between them, take her out on the date and use the program
Roxy:Take her out on a date and say that you'll kill the AI. After the date you need to talk to the Roxy AI actually to delete it and the next day you will get the scene (thanks for pointing it out)
Passwords:
cobaltbahamut
tomnovember