One day the body of Female Teacher, the Tomomi was detected in a gymnasium. Although the autopsy result called the heart attack was given, Younger Sister, the Mari of the Tomomi holds a question in the cause of death of the So, and start for its new post as Teacher in a school of the So. The Mari puts a body on a student, a school doctor, the vice-principal who seems to be connected with Elderly Sister something or other, and approach, and arrive at unexpected Mami…. The choice which the collection of NG collected in main part! ！
