Just binged the entire thing and live tweeted my reactions, can be found under the same name on twitter.
I can see the vision! I had a really good time reading this manga and I was impressed by how much your art has improved from the beginning of the story. I have always liked stories about immortals and Ramia fits the bill, although I suspect she was blessed with some sort of eternal youth rather than immortality. She just put that youth to good use and became monstrously strong throughout the centuries.
Art wise I love the painterly graphite style, their are some monster designs and landscapes that rival some of the best in the business. On a technical level its very very good. Towards the beginning I will say some of the panels that were busy got a little muddy, but thats something that became less of an issue the more your style began to settle.
Character Designs are pretty good, the humans are all more or less standard fantasy dudes and gals, but man the DEMON designs are top notch. I have always deeply appreciated the human form and that's something else the artist excels at. Nobody in this manga is ugly and everyone seems to be greek gods and goddesses. Lots of muscles and pretty people all around.
Story wise I am definitely interested, Ramia seems to have a dozen descendants scattered around and its funny seeing them pop up, makes sense if you take the valentines day art seriously though. At the moment the story feels a little rough, we have a few plotlines running parallel, and a flash forward that we have seen. While I can see a satisfying conclusion coming the journey is a little all over the place. We have the training arc, guild battle, ramia and the lord, and the archmages tower. Lots of threads. Still the BONES of the story are SOLID. I like that we as readers clearly understand that the demons are powerful and they remain a threat. We also see that they are irregular and could potentially even rival Ramia. I also enjoy the idea of the holy swords, and the fact that their are some that are lost meaning that heroes could pop up everywhere.
For now I eagerly await the next chapters!