Ten years ago, Miwa divorced her husband and raised Shiro alone. She worked hard so that he wouldn't feel pitiful, and before she knew it, Shiro was graduating and had secured a job at a major bank. Although child-rearing had come to an end, Miwa felt a sense of emptiness. When Miwa lost her life goals, Shiro invited her on a hot spring trip. Thus, Miwa and Shiro set off on their graduation trip for two.
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