I'm sorry it took a while, but you can check out Pastebin for my translation of the latest chapter. The usual caveats apply - it's an English translation of a Chinese translation so the language might sound a bit awkward plus there might be some inaccuracies.
My thoughts on this chapter: Oh dear god that senpai has come back to haunt us!! I didn't enjoy this chapter as much as the previous two because we got two spanners thrown in at once - Yamada fretting over how she and Kase will be separated because she's going to a local college while Kase is going to either Tokyo or Osaka, and now Yamada's insecurity about Kase's exes.
Based on the chapters I've translated so far though, I am pretty sure that Yamada might be Kase's first official girlfriend. I think Kase is just generally very friendly and close to some girls but Yamada might be the first girl she's really liked? When Yamada had asked whether Kase had been to other girls' room, Kase's response seemed to indicate that she hadn't been to many (if any at all) for a while. And she doesn't seem inclined to bring girls back to her own room either... I guess we'll just have to wait for more chapters. The wait is killing me!