I've played quite a number of VNs for the dialogue jam. A good number of them had pretty high production values for the event, and Lady Anneliese Dies could be another of them. There is plenty of delightfully fitting music and art here (most of it appears to be free assets, such as pixabay), but the overall product feels pretty high quality, with the mysterious and otherworldy vibes.
A powerful heiress (whom you play as) dies under mysterious circumstances. Using some mystical powers, she travels back in time to figure out who or what killed her.
There are three main suspects, along with a few other possible options like a stranger or a self-inflicted death. The game puts you through a couple of scenes as you move back in time to see what happened and figure out who the murderer is. Still, I was unable to solve this one, and it seems (I might be wrong) that the developers wanted this to be somewhat ambigious so that people could discuss possible theories. Anyway, I'm pretty bad at solving mysteries, so there's probably little I can bring to the table. Still, it was an enjoyable read, even though I'm scratching my head now.