Pffft! This manga is going out of nowhere. The mangaka seems twisting the plot. Let's just say, at the end Yuu stabbed Haruka because she had frustrated of not kissing Haruka anymore. Kotone's family came back from America with a science baby and surprised that their friends became crazy and uncontrollable. At the same time, Yuzu and Kaede were trying to have sex together so then they separated themselves from their friends. How about that?
And this still in chapter 49, That Sumisumi still not graduated yet.