According to the pics on official site,
girls are to be spanked by Kenkoba if they give a wrong answer(in quiz?),
and a girl(AYAMI Syunka or so) is probably spanked by him...
We can watch this scene on FC2
go to 24:00
In this movie,three girls（(AYAMI Syunka,KIDUKI Anri,and YATABE Kazusa)try a quiz game and they are spanked each time they give wrong answer.
......Finally they all punished for poor performance in this game.
I found this spanking movie uploaded on youtube!