At the beginning of the new semester, the children who were promoted to the sixth grade welcomed a new teacher, Maya Akutsu (played by Yuki Amami). In the first class, the serious teacher Maya made a comment about social injustice and cruelty, saying that in the future, differential treatment would be implemented in the class, and the only criterion would be the weekly test scores. Kazumi Kanda (played by Mirai Shida) was very dissatisfied with the teacher's high-pressure policy. She and the troublemaker Yusuke Manabe (played by Naoki Matsukawa) always played against the teacher, and the consequence was that they were tortured to death. During a punishment, the top student Hikaru Shindo (played by Mayuko Fukuda) pleaded for Kazumi, but was punished by Maya. Soon, Hikaru joined Kazumi's team, and the three of them rebelled against the teacher together. Maya's extremely cruel educational policy gradually caused panic among all the classmates. They planned to overthrow Maya's control together and let her step down...