Tsubaki, who divorced ten years ago, raised Kouta single-handedly. Not wanting to make him feel pitiful because he was from a single-parent household, she worked tirelessly. Before she knew it, Kouta had reached the age of receiving an offer in the printing industry. With child-rearing over, she thought she could finally relax, but found herself lacking purpose. While feeling empty inside, Kouta invited her to take some time off and go on a hot spring trip. The two set off towards the hot spring town.
