地味女子の私が女の子の日にイライラしてたらなぜか百合ハーレムが出来上がっていたのだが？ (Associated Names)

Fumino Yurizono has braids and round glasses, and always reads in the corner of the classroom. But one day, she is irritated during her period, she doesn’t wear braids, she forgets to put on her glasses, she has sharp eyes and tone…And before she knows it, there are many girls around her…