I haven't finished yet but I wanted to drop off a rating in advance- I rarely feel such interest in wanting to get to know/romance the entire cast of a VN but Heart Sigil Elchemia is reeling me in! I love the world you've set up, the characters and their interactions, and the plot that I've interacted with so far. I'm heavily intrigued and I can't wait to finish the demo and put up a proper review!