A few things need to be said.
Just because I rate this demo a seven out of ten doesn't mean I enjoyed it, it means there's certain things you've done wrong with it, being as it is a demo, you should inspire people to pay for it, here's my problems with this demo:
1: You called this a demo, there was no sex scene's (that I found, at least.) in the demo, a little eye-candy or even one eye-candy would inspire us as an audience to buy your AD2 game to play the full version, but I like your artwork and the development and hard work put into this series, so it's great nonetheless. But for a Hentai demo, this is quite pathetic, sorry if I'm rude in saying that, but this is my review on it. If something is a Hentai, it has sex scenes, you only showed skin in this, and there was hardly any pussy to count this as a Hentai, but it's a Hentai in itself considering it's apart of the Hentai Game itself. I would've appreciate this Demo if it had at least one sex scene, and as I said, if I missed one, I'm sorry for this review.
2: There's too much failures, there should be at least two paths in a story line for each character that would equal as a mission complete. The sort of story progression you did is the type of progression system as a maze, you go into the maze with one entrance (the start of a particular story with one girl), and there's dead endings (failure of the story), and one finish (completing the story correctly.) So to make this fair, I will give you props for the hard work, great art work!!! And congratulating you on any successes you come to in the future and on this game!!!