If you open one of the files named 'Student#_Relations.stuff', you'll be greeted with something along the lines of: You can open either of these files with your standard text editor, so there's no need to download anything. Now you may notice that each line (per student, including their self), has 5 values but only 3 have been identified by the file.

The first 3 values are Amity (friendship), Love (romance), and Lust (well, lust.), and the last 2 seem to be unimportant. You can put any number you want for those 3 values, but keep in mind that it caps at 100, so if you put 500 or something the game will change it to 100.