I thought Kase was being overly-controlling early on in this arc, but not particularly in this sequence.
One of the charming things about this series is the enormous distance between the way each of them sees the other one and the way they perceive themselves: to Yamada, Kase is the coolest and most together person in the universe; Kase sees herself more like her senpai did--as kind of a goofy airhead whose main positive point is her athletic ability. Kase sees Yamada as the most desirable being in the universe who could have any partner she wanted; Yamada sees herself as hopelessly childish and naive.
So their affection for each other comes with a big helping of insecurity. That could certainly turn toxic, and it has led to such misunderstanding as they have had. I'm sure someone can go through this arc making moral judgments that one or the other was in the wrong at this point or that, but insofar as there is a flaw in their relationship, this is it--not that Kase is excessively controlling or that Yamada is too unaware to know how Kase would react to her going to a mixer, but that at some level they each think they're not quite good enough for the other.
EDIT: Or put another way, they each can't quite believe their own good fortune that someone so amazing is in love with them.
Kase showing up out of the blue at a social gathering Yamada attended against her wishes and then attempting to physically drag her out is pretty yikes regardless of motivation. It doesn't matter how insecure you are you don't treat your partner like that. Like, her thinking that's an acceptable way to treat Yamada is also a flaw in their relationship.
last edited at Feb 21, 2019 3:38PM