Hahaha OMG I can't believe the author is actually trying to justify Yuyu's behaviour and even make her the 'good guy'. The author is trying to convince the reader that Yuyu's abhorrent and atrocious behaviour was just her trying to show the class their 'true colours', however that doesn't make any sense as in the beginning of the story she was directing this behaviour solely at the MC. It had nothing to do with showing people's 'true colours' and it was purely horrible and spiteful behaviour towards Nana, yet the author has completely ignored that fact for the sake of this cheap fucking forgiveness ending that we're getting. What a load of shit.