Misako, a single mother, has raised her only son Nobuo on her own while he attends prep school. Their modest yet loving household is shattered when Misako suddenly loses her job. Desperate to pay for Nobuo's tuition, she searches tirelessly for new work, but with no skills, her options are limited. Forced to sell her body, Misako endures the daily humiliation and shame of being with strange men. One day, Nobuo discovers his mother's secret... and their lives take a dramatic, irreversible turn.