If it were me in Yukishiro's shoes, I would like to bring the letter to the court first, for defamation. I would like for evidence for the accusation first. And I will say that in the class. Out loud. Sure, that's the teacher, but all the more reason. No proof, no groove. In any form of accusations, the requirements of making it first is that there must be a form of evidence first, not just a letter of accusation. Where's the solid evidence? Just someone saying that she's the perpetrator. Heh.... What a joke. And you call yourself a teacher? If it was really me in her shoes, I will truly take this case to the court for defamation. I won't be joking. Whoever's doing this is actually asking for war, and this isn't going to end well.