Ten years ago, Rikah divorced her husband and raised Daimei on her own. Despite being a single mother, she worked tirelessly to ensure Daimei wouldn't feel pitied, and he made it all the way to university. Before she knew it, Daimei had secured a job offer at a printing company, and child-rearing finally seemed to be wrapping up. While she felt relieved, she also experienced an empty feeling as if she had lost her purpose in life. It was then that Daimei invited her, saying, "Why don't you take some time off work and relax? Let's go on a hot spring trip."
