Venus Puts Fur on Me.

Vol.4 Chapter 38: The Barbed Wire Cage
Vol.4 Chapter 37: A Do or Die Plan
Vol.4 Chapter 39: A Horrific Hors D’oeuvre
Vol.4 Chapter 37: A Do or Die Plan
Vol.4 Chapter 39: A Horrific Hors D’oeuvre
[It is not just "bullying."] Nakajima was ruling over the class as a "bully." The subject of bullying is a fragile girl, Shirasaki-san. Going as far as violence, every day was horrible. Everyone in the class pretends to not see it. If they stop, then they will be the next target. Nakajima performs "bullying" as if possessed. It was clear that something was wrong. Why does he do such brutal acts? The reality is terrible—