Kouichi and his friends found the tape Matsunaga left in the old school building, but the casualty count continued to rise. So class 3, led by Ms. Mikami and Chibiki, begin their class trip, where Kouichi, Mei, and Teshigawara meet in Mochizuki's room to listen to the rest of Matsunaga's tape. Through it Matsunaga tells them what he did to stop the calamity...