I'm part of the student body.

[ So in the broadest sense, yes, she is part of his group. But she wouldn't be caught dead being part of his Group. ]

I'm interested in the school, yes, and I plan to lead the students to the end. I am also aware that I cannot do everything on my own...

[ That's why student council. That's why she puts up with the likes of Komaeda and Natsume. ]

So pull your weight and make some damn friends, Komaeda. Stop bothering me.