1880, at the very limits of American West, the small town of Big City is awaiting the arrival of new immigrants. But on its way, the caravan is attacked by Indians. All the adults of Big City go to rescue the immigrants… Next morning, the children of Big City awake orphans. The only remaining adults are an old alcoholic and a simple guy. From this day, the simple guy becomes a sheriff, the old alcoholic Justice of the Peace, and Big City now has a child-mayor, a child-barman, a child bar hostess… every child replacing his mother or father in their occupation.