I don’t know who writes it, and I wouldn’t exactly call it a masterpiece (though to be fair, I am reading translations,) but it is a fun premise. I started reading it because it’s one of the few sources of official Hatsune Miku lore (though ultimately everything is canon,) but the stories focus more on the human characters, with the vocaloids mostly just being there to support. Still, the stories can be compelling.

At this point, half the reason I’m still reading is for the human characters, and the other half is to find details on the premise, such as how it works with thermodynamics, whether the cafe world has an economy, how biological the vocaloids are (do they need to eat?), and how long it’s going to be before anyone finds out that their bestie/sibling/trainer/etc has their own virtual world too (they don’t do a great job of keeping it secret, but they also don’t do a great job of investigating.)