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At 23, Miyuki is a young "office lady" in a big publisher company in Tokyo. She is just starting her career and has already met someone at her workplace, Seiji, but neither of them can afford living outside of the familial cocoon due to financial difficulties, even if they think about it often. Miyuki is Ayako's big sister. Even if the two sisters aren't that close, Miyuki seems to care a lot about her younger sister, even if Ayako doesn't seem to always appreciate the attention.

As Ayako is often seen with her cousin Aoi, Miyuki is quite close to Aoi's older brother, Kenji.