Another: Third Period

Without anyone noticing, the total number of people in the class increases by one extra. Then, at least one person in class 3-3 dies every month. As a countermeasure, someone in the class must be treated as 'non-existent'. To make up for the 'dead one' in class 3-3, Misaki Mei was chosen to be 'non-existent' this year. Sakuragi Yukari and her mother, Mizuno Sanae, Takabayashi Ikuo. One after another, more lives continue to be claimed by the 'Calamity'. And now Kouichi has been chosen as the second 'non-existent' student. But once the Calamity has begun, it will not stop.