Ryo, who divorced her husband ten years ago, raised her son single-handedly. Determined not to let him suffer from sleepless nights, she worked tirelessly, and as a result, her son advanced to graduate school and secured a job. While child-rearing had come to a close, a sense of loss overwhelmed Ryo. It was then that her son invited her on a hot spring trip. Ryo set off on a graduation trip with just the two of them…
