I remember Vivid Strike had quite a bit, but not much else comes to mind. Maybe Symphogear, Kannazuki no Miko, although these have more direct violence than bullying. Ange Vierge, Akuma no Riddle, big titty Nanatsu no Taizai and Valkyrie Drive, again more violence than bullying. I think White Album 1 has bullying, but also a serious case of 2DPD so I didn't get very far in. Yorimoi had a small girl-on-girl bullying subplot.
Konohana Kitan definitely doesn't fit the bill.
No idea how you'd search for this more efficiently, because even for my recommendations I couldn't use any filter terms and had to browse through the list of completed anime.