This time it's about something connected to the school, Shinobu-sensei works at. It seems that there is some bullying going on in Shinobu's class, but the reasons are not just plain hate or search for dominance. She has to dig deeper and finds some interesting facts about a pupil of her and the former head-teacher of her class. Additionally, Shinobu has to fight one of her colleagues that is nagging about her teaching style.