>>1934585The Chisato side story from volume 8 was around 12 pages. With this one being at the very least 40 there's a chance for it to contain multiple girls including Chisato. There's also the chance it could soley focus on Yuki considering she really hasn't had that much solo time with Basara compared to other girls.
Either way I hope the author continues to write side stories, because they are a good way to give further details to stuff that gets glossed over (the end of Chisato's part in volume 9 for example).
Unrelated news
I should be getting part 1 of Yuki and Kurumi's volume 9 stuff at some point today so certain individuals should be checking their emails soon.