A figure of significant influence in Kazuko's life, she is portrayed as a stoic and dignified woman who symbolizes the fading Japanese aristocracy. Her interactions and presence shape much of Kazuko's internal conflict and reflection.

Kazuko's brother, who returns from World War II with a sense of disconnection and a dependency on opium. His struggles with addiction and personal despair play a critical role in the family dynamics and the unfolding narrative.

An influential figure in Naoji's life, Mr. Uehara is a celebrated novelist who represents the working class and harbors animosity towards the aristocracy. His complex relationship with both Naoji and Kazuko adds depth to the novel's exploration of societal change.