A yakuza don sends his daughter to finishing school to make her a lady, except the school is a murder factory run by psychopaths. She solves every problem by being exactly what she was trained to be: a killer from a crime family. The comedy lives in watching elite institutions crumble against someone who has nothing to unlearn and everything to prove.
Kukunosuke Abashiri grows up surrounded by yakuza muscle and criminal enterprise, so her father makes an executive decision: she needs refinement. He enrolls her at an exclusive boarding school, expecting her to emerge as a proper young lady instead of a gang member. What he doesn't know is that the school itself operates like a criminal organization. The faculty are unhinged sadists with weapons training and murder on their minds. The student body fights like they're settling territory disputes. Teachers hunt students. Students hunt teachers. The entire institution is designed to eliminate rather than educate. Kukunosuke arrives ready for etiquette lessons and instead finds herself in constant, brutal conflict. She's tougher than most of her would-be killers, but the school keeps throwing escalating threats her way. Black comedy and over-the-top violence collide as she navigates an insane institution where survival means outsmarting and outfighting everyone around her. The question isn't whether she'll graduate. It's whether she'll make it out alive.