Nezu and 23 other former members of Class 6-2, who had gathered at their beloved school for a reunion, were held captive for three days and were involved in a major incident that resulted in the death of 13 people. The captor is Mikio Yumesaki, a former classmate. Mikio’s goal was to test how much “goodness” a person can maintain in an extreme situation where their life is in danger.