I know this is heaps late and it's very likely that you've chosen a related text by now, but I have to recommend a jap movie, Confessions (告白, Kokuhaku) that came out earlier this year. It's absolutely fantastic! If only it came out earlier, I would have used it as my related text (I graduated in 2009). It's about a single mother who teaches at a junior high school whose daughter was murdered and she suspected someone from her classroom. And so the movie is shown from different perspectives of her, the students (including the murderer), etc... it's really scary how morbid some of the school children are... It's really interesting since there's no good or bad in this movie as everyone has their own motives for revenge/the way they act.