I don't know what her deal is. She just seems like the most fun hating bitch in EN. Somehow even more than Shiori, and that really takes a lot to do. She is an enormous killjoy in anything and everything she is a part of. She even hogs the screen every week with her stupid bullshit "puptalk" because she cannot feel completely outdone by her sister.
Honestly, it really is too bad they share a channel. I imagine Fuwawa would've left her in the fucking dust if she wasn't chained to her cunt of a sister.