Rule -消滅教室-

Yashima Kashiwagi is a freshman who has transferred to the elite Kusushu Gakuen High School. He quickly became friends with Hasebe Yuki living next door and Kimi Miyazaki. As soon as Kashiwagi though asked for the name of a certain classmate, he was surprised that the attitudes of his two newly made friends changed. In this high school students do not go against the absolutely "rules"! What will happen if he decides to disobey them?