During an uneventful bullet train ride, a catastrophic event occurs and buries the train and its passengers alive in a collapsed tunnel. Bloodied and broken bodies are strewn everywhere, and only three students aboard survive: Teru, Nobuo and Ako. While Teru and Ako are focused on trying to find a way out, Nobuo descends into the depths of madness, pitting the strangers against each other. With no news of what's taken place to cause this accident, Teru, Ako and Nobuo must fight to survive. However, even if they are to escape, what waits for them outside is unknown and terrifying...
One night, Hiroshi is bothered by incessant knocking coming from the hall outside his door. He sees a large, stringy-haired woman pounding on his neighbor's apartment door, though she leaves soon after. However, the next day the woman returns, and this time she seems to have her cold, frightening sights set on Hiroshi...