The Abashiri family is infamous for their criminal activity throughout history. Hoping to provide his cherished daughter Kukunosuke with a chance at a better life, Papa Abashiri makes the decision to send her to a prestigious boarding school with high hopes of her being raised as a proper lady. However, her aspirations are thwarted as she finds herself enrolled in a school that cares little about the success of its pupils. The faculty at the institution exhibits disturbing behavior and the students are unwelcoming and violent. As tensions escalate between teachers and pupils, Kukunosuke is forced to fight for her survival. Will she be able to successfully navigate the horrors of this school and graduate before it's too late?