So uhhh... I'm going to just... Ignore the clown over there openly rooting for rape and, leave my two cents here.
I think this arc has been really good thus far. And I think in all of this I've come to..... Dislike Nene...?
Because it was shown plenty of times that she can't seem to "properly" support and root for Sumika if she were to find love. And when she suspected that Kanoko got together with Hime instead, she smiled and said "guess I got ahead of myself with my support, sorry Sumika".
She knows Youko more than anyone and still let herself be manipulated by her again.
Of course this is all added to the one big fiasco she caused by not noticing Sumika was always looking out for her and instead was too busy getting her jealous and playing with her feelings.
Meanwhile what many seem to be ignoring here is that Kanoko is young, she's a high-schooler for God's sake, getting manipulated by some freakishly silver tongued snake. And while meeting up with Youko despite Sumika clearly telling her and everyone else that she was bad news wasn't the smartest idea, we already know Kanoko isn't the brightest when she sets her mind on something as well.
There is differences between the two and throughout the whole thing Kanoko seemed to hold Sumika at a special place from the beginning.
We'll get to learn more about her in the next chapter which is really nice, and I'm really hoping that once everything settles down, Sumika gets the treatment she deserves for being the MVP of this manga from the very beginning.