A businessman, Tsuda, runs into a childhood friend, Kojima, on the subway. Kojima is working as a semiprofessional boxer. Tsuda soon begins to suspect that Kojima might be having an affair with his fiancée Hizuru. After an altercation, Tsuda begins training rigorously himself, leading to an extremely bloody, violent confrontation.
In a suburban landscape, the lives of several families interlace with loss, despair and personal crisis. Esther Gold has lost focus on all but caring for her comatose son, Paul, and neglects her daughter and husband. Lawyer Jim Train is devoted to his career, not his family. Helen Christianson wants to find a new spark in life, while Annette Jennings tries to rebuild hers.
A retired boxer intends to return to the ring for one last shot at the title, but first he must make the weight. Holed up in a room in Las Vegas with an unscrupulous trainer, he embarks on an intensive and illegal weight-cutting program.
A nightmarish evening unfolds for neighbors David and Robert when they accidentally hit a woman on her bike and flee the scene. While David is increasingly plagued by feelings of guilt, Robert shows no remorse and becomes overbearing and possessive.