Okay, so its one screen left and above. Thanks.
Btw girls will sometimes disappear if youre dont resque them. Busy doing something else, talking to commander killing bosses etc.
And they will not appear again, you have to reload save.
Not quite, It is very likely that it has something to do with the SOS system.
SOS1 = 1 people of group [1] are saveable which ones is still uncertain. As example the girl in front of the first badit base
SOS2 = 1 people of group [2] are saveable, which ones is still uncertain. As example droid in slime territory, girl in first bandit base.
SOSX [1 or 2] = 2 means you are with someone you are saving from group[1 or 2 ] (I think he wanted that it counts -1 instead of +1 so it is 0.)
SOSX [1 or 2] = 0 means there is no one to save, both are 0 mostly after you saved someone.
If you enter and exit an area often the number will chance if you are near a spot where you can rescue someone, these spots never change.
I am 99% sure with this theory, the only thing that is annoying me is that I just can´t seem to find the last girl in the super tiny space that is ??? area.
Edit: This is why you can miss people that you want to save, they are not allways there.
Edit: More examples
Another Edit:
While explaining SOS I might as well explain some other stuff.
危険度 = degree of risk (You could call it danger level, lowest is 0 [no enemys] highest is 6 [strongest enemys], the higher the more expensive is the revival)
ビーコン = beacon, (the things you have to gather for the story and entering the huge volcano at the top of the map.
Edit: made my theory right before someone corrected me