Lost in a ghost town, Ako and Teru form a shaky alliance with two soldiers who defected from their squad amidst the chaos: Nimura, the loose cannon in charge of the AWOL crew, and Iwata, their helicopter pilot. But when Teru falls severely ill, it's up to Ako to embark on a days-long hike with Nimura to find the medicine that might save Teru's life. Just before they reach their destination, however, the two encounter a young man with surgical scars covering his scalp. Strangely unable to feel pain, he mutters two cryptic words he claims explain the catastrophe that's devastated Japan: Dragon Head. But before they can dig deeper, a gang of murderous rioters emerges from the shadows…
