As the series progresses (reaching a total of ), it evolves into a "battle manga" between various psychopaths in the school, each with their own extreme fetishes and motivations.
The story follows , a boy who appears to be a ruthless class bully targeting a girl named Hana Shirosaki . However, the "yabai" (dangerous/crazy) truth is that Shirosaki is a masochistic mastermind who blackmails Nakajima into bullying her, threatening to kill his family if he stops or if his "bullying" isn't creative or intense enough. As the series progresses (reaching a total of
In this chapter, the focus shifts to , a character who has become increasingly involved in the twisted dynamics between the "bully" Nakajima and the "victim" Shirosaki . Nakajima, who is actually being forced to bully Shirosaki by Shirosaki herself, is constantly pushed to perform more extreme acts of "bullying." In this chapter, the focus shifts to ,