Strange suicides shock the entire country, especially because all victims visited the same school. Weiss get assigned to the case, so Aya enters the school as teacher and Sena gets student. Sena soon finds a friend Nozomi Miyazawa. Together they talk about the things at the school. Sena soon gets in deeper and deeper. All students get a video with violence on it and students were taken out of class to a strange building. The next day Todo another student tries to kill him, but Sena stops him and has to pay for that.