wasn't that the point of this manga? it was her revenge. she will torture ALL of her classmates, none excluded, even Ai.
The point is that the girl was driven crazy. She's not acting like a rational revenge-seeker (ie, hurt the people who hurt her). She's out to hurt EVERYONE, because in her mind they all allowed the bullying--either by being active participants or giggling along or ignoring it and not assisting. She sees them ALL as guilty participants in her abuse. She's mad. Totally bonkers.
I agree. It's very difficult to see how they are treating the wimpy guy who helped them so far. He killed the guy. So what? She's arranged the death or torture of others. If she can, why can't he? She's a hypocrite.
Sorry but I didn't like this manga. In the beginning it was good but I don't like how they are treating that boy, I don't know what's his name. They treat him the same way they were treated themselves which makes them as bad as everybody else in class. They have no right to be angry about being bullied when they themselves bully others. So no, that stopped me from liking this manga.