"Hitoiro" (一色; One Color) is Mika Nakashima's 20th single overall and her second under the name Nana starring Mika Nakashima.

The B-side, "Eyes for the Moon" also featured in the movie.

"Hitoiro" only managed to debut at #4 in the daily charts.

Furthermore, "Hitoiro" did not sell as well as "Glamorous Sky", which became the top-selling female single of 2005.

Total Reported Sales: 100,543* (as of 2008.04.04, last charting week)