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She is the illegitimate daughter of Misuzu Osaki, who left Nana in the care of her grandmother when she was four years old. Nana has not seen her mother since, and has thus forgotten what she looks like. Nana's grandmother, Miyuki, was very strict, and forbade her from wearing the colors pink and red because she did not want Nana O. to "tempt" men and become like her mother.

Source from Wikipeida