Well, absolutely nothing happened storywise since chapter 32. Just Ran and Keiko living like a married couple, without being married or even being a couple.
Depends on what you see as a story. A lot has happened in my opinion. There's Keiko getting better with her trauma and nightmares. And Keiko adapting to Ran's teasing and trolling. And Ran going worried and/or jealous because of it. Ran trying to align the interests of the two and get closer to her senpai. And Ran mentioning drinks a lot, especially when things don't work out the way she wants them to. Finally, the idea of two separating has been plotted. It's not a story as in first A did B, then C did D - it's rather like seemingly random puzzle pieces forming a single picture after being introduced to our eyes.
btw, checked the Dogura Magura reference from ch.35 - book by Yumeno Kyuusaku recommended to Keiko by Ran. Apparently there's also a movie after the novel - Ran sure likes deep stuff. All the more reasons to adore her!