As discussed in the main discussion thread for the manga, that's just the compilation of the just-concluded arc. Plus, it says "final volume" right there in the translation. How can you expect there to be more?
I was thinking there was going to be a twist with the dove in the night of the ball scenes at first.
Edit:
My thinking was probably influenced by the webnovel Cinderella’s Older Sister Reluctantly Marries the Prince, in which Cinderella runs off with the fairy godmother analogue (a wizard), and...
For reference, the Japanese name of the Enlightened Ones (people of Zeal) in Chrono Trigger is 光の民, same name as the fans, which is why he thinks of the game.
I saw the source material for this several years ago, when the Mistakes Were Made group did a few teaser chapters.
https://www.novelupdates.com/series/auto-assigned-villainess/
I saw another reader's rationale on Reddit (link to comment)
tl;dr: too much time is passing in these shorts for them to be set between the nicknames being assigned and the arrival of third-Karin.
I don't think they meant a disguise/acting to fake there being two versions, they meant exactly the premise: a version who came from a parallel world. It's just that especially in the one-shot version, it's easy to get the impression that Sui-2 is from a future where Jogo wasn't saved in the...
@degenerateafro
Actually, the first chapter seems to be a prophetic vision, not a flash-forward. See the later translations of chapter 2 for the mention of Chloe's ability being showing people their future.
So Blair did know about that intro (but probably never realized its origin or she later...