My guess as to why she looks so sad is that she didn't want to be in a porn movie, she looks pretty ashamed about it. I doubt it was even her idea, she was probably put up to it by her family because they needed a lot of money fast and thought she could do it in porn (she is pretty cute). But instead her dvd ends up selling for the price of a happy meal at McDonald's and she ends up standing on the street in the cold promoting it.
It's also a photoshop, so don't feel too bad.
Not that young girls don't hock goods and promote things standing around in Akiba like that, but you can see from her face...the pixels don't like right.