A former soldier is branded an idiot because of his epileptic seizures caused by wartime experiences. He shows unbridled compassion for people after he moves in with friends of his family as he tries to help a young man ruined by the war and a woman hounded by a wealthy but cruel suitor. All the characters are victims of the war and its devastating emotional aftershocks. Taken from Feodor Dostoyevsky's classic novel, the screenplay was written by the film's director, Akira Kurosawa.