I saw this stream on the front page of Holodex around 11 hours into it and Jurard had almost 4.5k viewers at the time, which would have been his fifth highest CCV ever, behind his first three streams and his new outfit reveal earlier this year.
I was going to post about how the blanket Pokemon perms have been good for even Holostars, but then I thought maybe he was being botted or something, since he's usually a high 3/low 4-view for most streams. The Playboard looked like this:
Checking the chat comments on Hololyzer showed that what actually happened was this:
1. Biboo streams Monster Hunter for 11 hours, then raids into Iofi with 27k viewers
2. Iofi (who is also playing MH) raids into Jurard half an hour later with 19k viewers
3. Jurard streams for another five hours and retains around a quarter of those viewers by the end
It's still impressive that he retained any of those viewers at all, considering Biboo has a pretty unicorn-heavy fanbase like the rest of Advent.
Regarding the Pokemon perms, a couple of hours later, Rio was streaming another Pokemon game to around 3k viewers.
This is notable because he usually maxes out at 200-300 viewers for solo streams (like the rest of Stars JP other than Roberu and Aruran), it was 3 AM in Japan, and he didn't get raided, so it appears that Pokemon is a big draw for female JP viewers, as well.
As an aside, every member of Stars EN averages a significantly higher CCV than almost everyone in Stars JP; most EN streams usually have low 3/high 4-figure viewers at any given time. The first generation of Stars JP has been streaming to 200-300 viewers for almost six years at this point; Miyabi mentioned once that his debut stream had a couple dozen viewers, so averaging a Finana is still an improvement.