Kanako, who has raised her son alone, is leaving home to get a job. Deep down, she feels very lonely. Looking back on her life, Kanako wonders if this is the end of her life as a woman. One day, she is invited on a hot spring trip as a thank you for all he has done for her. Not wanting to be separated from her beloved son... Kanako's hands reach out to him, determined not to lose him. The mother takes her son's penis in her mouth and seduces him. They feel each other's warmth on their skin...