I don't know it the author comes here, but here is my feedback until now.
I expected more. Not that the previous game was a masterpiece, but it was simple enough and didn't try anything he didn't know how to do it. Well, that animation with Nicc breast bouncing that repeats into every interaction... bad, I mean much. First the drag is too slow and unneeded, what, did she came running? And the vanishing sequence serves only to remember that the CG wasn't fully draw and is missing the legs. Again, no need since you are not using the other portrait to simulate a conversation. Remove it, or do something about it. There are other ways to present portraits that are more smooth and don't give a headache.
And the corridor near the church, considering the size of the screen, that is claustrophobic and unneeded, there isn't even a building there. And the buildings are mostly squares, unispired, everything looks the same. You can make building in a variety of ways, and you should if the buildings are so close of the other.
Very little is ready indeed, I certainly wouldn't call this a demo. You made a town, some inner buildings and that's it. the population only greets you, no information is provided by them.
The story can be even more forced than the first. I mean, just so happen that guy was in front of the city, recognize Nicci, without ever seeing her face, or feeling her power (could be other succubus), power which she was trying to hide, decides to betray his boss knowing what he tried to do with nicci, and sends her in search for an artifact, no details of what it is or how would she know when she find it, no concern she would decide to betray him and keep the thing for herself, and a first victim really forced. Seriously? A demon worshiper in the middle of a town that train exorcists, who accept nicci's orders immediately without even expressing any emotion, like excitiment, or something, or think that this could be a trap of the church, she just offer her body to nicci without even knowing what that means, or who she is (she didn't appear to have great knowledge of them, especially because she offered herself to the first demon she found, which means she is a worshiper but don't have a master to serve).
Sorry Seiryu, but you need to improve much. Trying to make things bigger requires more effort. The first game didn't try to be more than it was, this one began comming with a big plot, so more thought was sure to be required.