I usually get annoyed with VNs. Too many words, too little action, too little choice.
This is also a VN, and I should be annoyed with it, but it has good writing, an immersive story and I'm quite sure it would hold my attention if it was a regular novel, lacking any images and music. Also, the characters are interesting, and there is good character development.
There is also a lot of world building, and a lot of mystery, which makes this VN so great. A lot is implied, rather than showed, and this is very nice for people with imagination. This is also a weak part, because it could become a source of disappointment in later chapters.
There are plenty of pop culture references, to Dracula, or even Star Wars, and I'm sure I didn't catch them all.
Finally, the music is quite good and fits the overall mood of the VN.
Because of the reasons above, and because of the constant updates, I think it deserves 5*. But, for people looking for a lot of H-scenes, I'm sure this would be slight disappointment, since the story and the characters are the actual focus here.