When it comes to "unfinished" chapters, the author quite literally draws slices of life - they look for some meaningful event or conversation in the life of the characters, cut or slice it out of the life timeline, and draws it for us, readers. I believe everything that needs to be said is in there. Like chapter 24 ended with Botan affirming, that she's OK with going deeper (implying a relationship rather than a river). There really is nothing to be added after that. But because it's subtext, sometimes you miss it and then it feels like there's no closure.
Feel really sorry for Gujou, but really happy for Ibuki at the same time. She finally managed to drink with other people. I guess it means she also understands that drinking with Botan is fun for completely different reasons.
Also, clearly, "happy" is quite a heavy word to use for Ibuki, hehe. She sure used it to describe how happy she was to go out and drink with Botan in chapter 24, but is so freaked out when Gujou is happy to be working with her in the same company.
Looking forward to more chapters so much.