For me is like Shizuka is mad that Kaoru is making that face and experiencing those feelings for the first time, means that whatever they had in the past was only serious for her but not Kaoru, so in her shoes, even if we're no longer dating... That would hurt me too.
...except she's making the exact same face as way back when, ie. she's acting the same as presumably back when the two of them first got together (incidentally given her flabbergasted look my theory is Shizuka had to make the first moves to get the ball rolling at the time). Also Kaoru's the one who went terminally apathetic when they broke up so it sure seems to have been serious enough for her...
Rather I think Shizuka's panicking because she just realised she's losing the "first place" that has essentially defined their relationship for the past few years - she's now looking at a shared spot at the very best and far more likely second place, and that's clearly one bitter pill for her to swallow. Note also her downright desperate tone with Mio...
Way I read it it just dawned to her Kaoru's finally begun moving on from their old familiar routine and she's both frightened of, and feeling orphaned by, the somewhat sudden crumbling of the status quo.
Growing up is hard, as it were.
last edited at Aug 15, 2019 8:33PM