Sorry if someone already explained this, but what's the correlation between affection, stage and progression? I've been searching the thread but couldn't find an explanation. Maybe I'm using the wrong terms, because I can't be the only one who has this question.
EDIT1: What I could find so far from the OP and others is that the scene that STAGE refers to is unlocked by the PROGRESS (the blue number - the amount needed is inside the parentheses) and AFFECTION (the orange number - this one grows with character interactions).
I could not find how exactly you increase PROGRESS but the amount you have of AFFECTION and PROGRESS is listed at the top of the phone page.