UnluckyStrike's Manga

I think so far(ch.2) Akari(but probably doesn’t remember it), that short haired one, who doesn‘t wear a ribbon or a tie, and one of the teachers seem to be the likely candidates for a wolf, unless there is some underlying conspiracy(and quite probably there is one) with more than one person involved. Feels like one of those plots where the culprit‘s sister, who was one of the academy’s students previously, was seduced by some other girl which got her life ruined, so the culprit is taking revenge on the school while making a statement.