Mad Girl Revenge: Kuzu Doukyusei, Zen'in Koroshimasu
マッドガール・リベンジ クズ同級生、全員殺します
A high school teacher named Hagiwara deals with disruptive students in his class. A new student, Yui Katsuragi, joins the class and appears to be an ordinary girl. She transferred to the school with the sole goal of seeking revenge for her younger brother's suicide. Yui holds Hagiwara responsible for not preventing her brother's death and involves him in her plan for retribution. The story follows her efforts to punish the bullies she believes are responsible.