The Underground Student Council is a fictional organization in Prison School that enforces the traditional rules of the school code of Hachimitsu Academy. Though a vigilante organisation, they enjoy more student popularity than the official Student Council. Here are the three of their members: Mari Kurihara Mari is the president of the underground student council. She is the daughter of Hachimitsu Academy's chairman and the sister of Chiyo. A cold and calculating figure who seeks to uphold the school's traditions and rules. From the very beginning she immediately despises the boys, and the chairman's decision of integrating the academy. Much of this stems from her own resentment of her father's perverted behavior. In middle school, Mari helped Meiko stand up for herself when she was bullied by Kate, and the two have remained close friends ever since. She, like the rest of the Kurihara family, employs a strange philosophy to judge one's character. Her philosophy is,...