Does Mr. Yamamoto really have any reason to fear for his daughter? I'm American, and not very familiar with Japanese culture (though I seem to be learning a lot between Tamao and the webcomic Red String), so this is an honest question! I can't imagine any parent in the US fearing that a teacher will do something to his or her child, unless it's a molestation fear, which would have nothing to do with revenge. It's the schools that fear the parents.