High school students Tobio, Maru, Isami, and 20-year-old Paisen, who graduated from high school a long time ago are contented with their lives. One day their ordinary routine completely changes. Tobio and the rest plant a home-made bomb at the school next door in revenge for Maru’s vicious beating at the hands of delinquents. However, the bomb which was only intended to shock the delinquents, ends up causing a huge explosion that claims many victims including friends and seniors. This triggers the start of their life on the run.