I really liked this, it is pretty funny that Kyosuke was pretty much naliing it and Rui kept fucking it up.
I'm still slightly mystified by the ex-boyfriend. From the way he was presented so far, he seems like a genuinely nice person, but then you had these "I'll make them divorce" comments which don't really seem to fit his characterization at all. You'd think that in this chapter he was ready to give up and report to the parents her daughter is happy until they found the papers. Either there's more to it than that, or it's a bit of an inconsistent characterization on author's part. Or maybe Kurumi is right that he's a stalker and she should punch the shit out of him more, I honestly don't know at this point.