教育改革之后，学校内的景象并未发生根本性的好转。学生上课插科打诨，浑浑度日，作为教师的一群人也丧失了金八老师的热情，与学生尽可能低拉开距离，减少接触。在这些人当中，高仓夕子（荣仓奈奈 饰）无疑是最为极端的代表。她是东京都立国文馆高中高三教师，坚信人的本性充满了邪恶和自私，对于学生任何课外辅导的要求都会提出以金钱作为交换。她和同事内田堇（市川实日子 饰）、藤井彩（小林聪美 饰）结成联盟，在夜晚以暗黑女教师的身份接受有丰厚报酬的委托，对出现在学生中间的各种问题进行课外辅导。

Takakura Yuko (Eikura Nana) is an ordinary chemistry teacher at a famous government-run preparatory school by day. But at night, she is a super teacher who solves a variety of difficult problems rampant on the school grounds that require more than sound arguments. From bullying to illicit sexual relations, marijuana and hallucinatory herbs. Her approach is “an eye for an eye”. She is willing to break the law in order to solve issues, and demand money from the people who seek help along with the classics teacher, Uchida Sumire (Ichikawa Mikako) and the art teacher, Fujii Aya (Kobayashi Satomi) whom she get on famously with despite their different personalities and interests.