Released in 2006, Hitoiro ("One Color") is Mika Nakashima's 20th single, and her second under the name Nana starring Mika Nakashima. The mangaka Ai Yazawa wrote the lyrics for this song featured in the second movie adaptation of her hit series Nana, in which Nakashima plays the role of Nana Osaki, the lead vocalist of a fictitious punk band.
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