Miwa, who divorced her husband 10 years ago, raised Shiro by herself. She worked with her single-mindedness not to make her feel pity, and before she knew it, Shiro's graduation had been decided, and she had been offered a job at a major bank. Her child-rearing is relieved, but at the same time, she is attacked by a sense of emptiness. When Miwa lost her life goals, she was invited to a hot spring trip by Shiro. Miwa and Shiro went on a graduation trip alone.
