Mina, the strict student council president, discovers the secret notebook belonging to her classmate Kouta, which details his hidden desire for her. She confronts him, but instead of punishment, she uses the notebook to humiliate him for her pleasure. She soon allows Kouta to obey her every command, forcing him to fulfill his written fantasies with her, transforming strict discipline into passionate, dominating intimacy that leaves them both breathlessly entangled.