In 2005, Nakashima co-starred alongside Aoi Miyazaki in the live-action movie "Nana", based on the manga of the same name, which was released September 10, 2005. She also sang one of the theme songs for the movie, which was released as a single under the name "Nana starring Mika Nakashima". The single, titled "Glamorous Sky," was written by the manga's author, Ai Yazawa, and composed by L'Arc-en-Ciel vocalist Hyde. It was Nakashima's only number 1 single on the Oricon Singles Charts. It sold over 423,000 copies in 2005, making it the best-selling female single of the year. The single continued selling well into the next year and sold 444,067 copies, which was about 25,000 copies less than her "Nana" co-star, Yuna Ito's "Endless Story". The single was featured in Konami's guitar/drum simulation game GuitarFreaks and Drummania V3, as well as Nintendo's Moero! Nekketsu Rhythm Damashii Osu! Tatakae! Ouendan 2.