Questions I have after reading this:
1) Is there clearly someone at fault for this situation?
2) Why can I actually see this getting worse from here?

Austin-Powers said:

Questions I have after reading this:
1) Is there clearly someone at fault for this situation?
2) Why can I actually see this getting worse from here?

1) No one clearly at fault, though the closest would be Nanase, getting angry at Kaga and expecting him to understand that (or Kaga for being unable to read Nanase's behaviour as advances, if you feel so inclined)
2) Because it's Wakabayashi Toshiya. Maybe we will see another character introduced, the chain will grow, and maybe even close like in Wa!?

As entertaining as I find Wakabayashi Toshiya's romantic misunderstandangs this one really is rather painful to read.

On the plus side, good to see that Sasahara and her sempai are still together. Her 100% couples success rate back in part 2 would seem to be true.

Japan sure loves characters that dense when it comes to love huh?