Teru Aoki (青木 輝), the main protagonist, on a train to Tokyo after a school trip. Just before his train enters a tunnel, Teru briefly sees something in the distance, though he doesn’t understand what he saw. Soon after entering the tunnel, a powerful earthquake derails the train and blocks both sides of the tunnel with rubble. Knocked unconscious during the derailment, when he reawakens Teru finds, much to his horror, that all of his teachers and classmates have died in the crash. Wandering the wrecked wagons of the train, he finds Nobuo Takahashi (高橋 のぶお), a highly unnerved boy who apparently was being bullied at school, and Ako Seto (瀬戸 憧子), who is unconscious and wounded.