Stunning. Just ... stunning. Precious few times have I been this emotionally effected by a visual novel.
I feel like I'm limited in what I can divulge because I don't want to accidentally spoil anything and I don't know if I could do it justice anyway, but the art is beautiful, the atmosphere haunting, and there is at least one music track that gets me misty-eyed as soon as it starts playing. I'm really, really happy I gave this a shot.