Making her way through life by forming superficial relationships, Yoko (Yo Hitoto) keeps everyone at arm's length, whether it's her father (Nenji Kobayashi) and stepmother (Kimiko Yo) or Hajime (Tadanobu Asano), the owner of a small bookstore who could be the father of her unborn child. Yoko seems most at home when she's riding the train, speeding around the city with only her thoughts to entertain her.