First things first, wow. Amazing job by the author. There's been a sort of lingering tension over what would happen if Kaede had met with his rapist again. Now, we see that fulfilled. I'm almost certain that teacher had some form of mental issue related to what happened to her after she got fired and jailed for what she did. Almost no way she didn't feel any sort of contempt for Kaede for supposedly exploiting her.
Second, I'm wondering if the next arc will focus on that character we saw Kaede interact with earlier in the story, the one who was having a hard time being attracted to people. Another guess is on Rio, the shopkeeper or one of Kaede's friends.