Soromon no Gishou plot
On Christmas morning, a 14-year-old boy falls from the roof of the school building. The police report the incident as suicide and the parents agree with this conclusion. However, there are many rumors surrounding the boy's death. Then the police receive an anonymous letter in which the writer claims to have witnessed the death of the boy and that he was allegedly murdered by three fellow students. When this letter leaks out and another student dies, the children decide to hold a tribunal themselves to find out the truth.