The nuclear disaster that Japan suffered accidentally alters the genes of the influenza virus. A group of young people get infected and haven't paid any attention to their illness, until a boy surprisingly bites a girl's throat in a drunken night out. Their friends start screaming at the gushing blood.
After a viral event, the government orders to quarantine the sick and evacuate all residents in the vicinity. But those drunk party people are not aware of this message. Meanwhile, the army and the police join hands to form a SWAT team to enter the quarantined zone. Those survivors suddenly become zombies to attack the living. In no time, the whole city is film with such huge bloodshed. People from all walks of life - including gangsters, policemen, SWAT teams and the civilians - are willing to work together to escape, but they have hidden schemes to compete with and they may even kill each other. The biggest test in doomsday is a human's mind.