We’ve got two more chapters in this volume assuming we’re following the 5 chapters per volume model, though the past three chapter have been a bit shorter than average (21, 28, and 28 respectively, they’re usually around 30-35 pages with some in the 40 range iirc), so the next two chapters could be on the long side. Or not. Who knows lol but it would make sense for them to be a bit longer given all that’s happened so far. The whole volume has taken place over the course of one day which is pretty crazy to think about (Kurumi and the terrible no good very bad day).
Additionally Kurumi and the girls are all second years, so they’ve got an additional year of school after this one. I have no idea if the author plans on going that far but there are quite a few open threads still about: Isanuma and the teacher, Azuma and Mine’s whole deal (we don’t know if the latter naturally a shit stirrer or if she has something against Kurumi in particular), Kurumi’s mom (who I’ve always assumed to be the final boss), Naoi’s family (dunno if missing mom and sister will show up but her dad is actively a problem), Kudou, Kokoro, Akane, the potential for some new awful thing to happen… the best route for both of them would be to get out of dodge after graduation, but they’ve got a long way to go before that