I haven't yet, although I will very soon. However, each being a completely separate story is literally the definition of
anthology:
- In genre fiction, categorization of collections of shorter works (such as short stories, short novels, etc.), usually by different authors, each featuring unrelated casts of characters and settings, and usually collected into a single volume for publication.
- A collection of selected writings (short stories, poems, etc.) by one author but unrelated to one another, generally compiled into a single volume for publication.
These cannot be tied together without this ceasing to be an anthology. Also, they are in completely different settings (modern-day, fantasy / medieval, and future / sci-fi) so it's hard to see how they could be related to one another, unless this somehow turns out to be similar to
Eon. Even then, though, it's not an anthology if they are tied to each other. That would be directly counter to the definition of the term.
What's more, SuperWriter himself has said he wanted to start creating "all these ideas" for separate stories he had in his head that were shorter than the VNs he's already done before. So based on his own words, these should all be unrelated, other than that they're by the same creator.