So this is the first review I have every written so please forgive me if I miss somethings as I am writing this after I have blitzed the shit out of the story in one day. This manga is the definition of an edgy train wreck, what started out as an interesting premise of a girl getting revenge on her class goes into an interesting psychological story which shows the main characters intriguing progression as she starts feeling different ways. This goes on for most of the story until the ending because my god the finale of this story is such a fucking train wreck full of OMG plot twists that the story goes from being interesting to being the edgiest of edge lords. The whole psychological part of the story is thrown out the fucking window as so many OMG moments happen at the end that the finale loses all meaning the story offered in the first place. Having the character basically become useless at the end was horrible to watch as it didn't feel like karma in this story was distributed right. Many of the characters get off surprisingly scott free and the point where you expect everybody to die in the end doesn't come out in a very satisfying way. Also wow fuck the and the story goes on dumb ass cliche.
TL;DR Overall the story is fucking awful, starts out okay and interesting but quickly devolves into a shitty trying to be to weirdly shocking train wreck as everything gets blown WAY out of proportion. Skip this one.