Description：Mai Kasai (played by Rika Adachi) and Shino (played by Aimi Enozawa) were classmates who attended the same school. Later, because of their parents' work, they both transferred from the bustling metropolis of Tokyo to a high school in the quiet countryside. In the original school, Xiao Wu played the role of a bully, and Shino, who was introverted and cowardly, was the target of her bullying. After coming to the new school, this relationship seemed to have reversed. Because of sympathy for Shino's past experience, Xiao Wu became the target of public criticism. Xiao Wu, who was ignored and endured life in school every day, decided not to listen to her friends' painstaking advice and fought back against the bullying of Shino and classmates. As a former "devil", what plans does Xiao Wu have?