Mad Girl Revenge - Kuzu Doukyusei, Zen'in Koroshimasu

Hagiwara is a high school teacher constantly troubled by the "problem children" in his class. One day, his daily life is turned upside down when a graceful student named Katsuragi Yui transfers in.

She has only one goal for transferring: to exact revenge for her younger brother, Kamiya Tohru, who committed suicide.

Deeming Hagiwara equally guilty for failing to save her brother, Yui drags the teacher into her plot, forcing him to become her accomplice in revenge...?!