Nice kinetic novel: the sound and images really do help set the mood, and its all well-written too. Good use of the theme, and the frame story is a clever way to bring many writers together without it feeling incohesive (but see my criticism below).
Nit-picks: Unzan is not actually present in the images, and the reaction to Mamizou's story feels a bit out-of-place, as if the frame story and other stories were written completely independently. Otherwise, there isn't anything to complain about. I especially enjoyed how empathetic the stories are, by which I mean that they do a good job of communicating how the characters might have felt when they died, where forgotten or locked away.