Okay, One thing I liked about the story is the fact that they suffer real consequences, the biggest of which is knowing that they ruined their own lives because of that wretched Kokujin, Because they know that all of this is happening because of them, I think Kaede and Kanoko are the ones who regret it the most because now, the family they were no longer exists, and there's no fixing that.
And I hope that some of the questions I asked come true, like Kaede expelling Kanoko, because in the story they are already in conflict, and I imagine Kaede doing this because she can't stand looking at her Kanoko forgets that she was the one who handed her over to Kokujin.
Another thing I didn't include, but hope happens, is Hiroki's cousin trying to make peace with her father, but her father says he doesn't want to know anything more about her, that she... it was Miserable, just like her mother, and says she doesn't see her as a daughter, and tells her to forget she has a father and not bother him.
Another possibility is that the teacher, someone discovered she was helping Kokujin with his school grades, and that she was deliberately giving Hiroki low grades, and then she ends up losing the employment and teacher's license, But they don't know that she was involved with Kokujin; they thought Kokujin was paying her to do it.
Furthermore, Ayume would be expelled from the martial arts club because she was skipping classes due to Kokujin.
These are some ideas of consequences they could suffer.