Where does the Demo end?

Where does the Demo for "This Starry Midnight We Make", end?

I have the Japanese Demo Long_500, apparently the latest is Long_510…

But in my try with it, I’ve gotten 6/7 of the person things for all four on the right, and Xinghua and Nagare together, and at least the first of the sets of two doll things for all 3 possible lines.

Where am I gonna see the Ad that’s clearly in the game files? I guess it might be blocking off the Golden Ending??