A group of 23 former classmates of Nezu’s 6th grade class 2 gathered at their alma mater for a reunion and were involved in a major incident in which they were confined for three days and 13 people died. The one who confined them was Miki Yumizaki, a former classmate. Miki’s purpose was to test how much human “goodness” could be maintained in a life-threatening situation. Who will betray whom and who will kill whom? What actions will people take in the midst of a disordered situation? Revenge, bullying, betrayal, exposure, and other unpredictable developments continue in this shocking suspense!