Three teenagers—Teru Aoki, Nobuo Takahashi, and Ako Seto—find out they are the only survivors of a horrific train crash that killed their classmates and teachers. Trying to escape the terrible wreckage, they join forces to deal with hunger, isolation, and a crushing sense of loss. Yet, with something evil hiding in the shadows, the group must resist their darkest urges and the urge to give in to insanity during these bleak times of hopelessness.