Each single that preluded the album was released as part of Kumi's
12 Singles Collection. Each one had unique
cover art based on certain cultures in various countries, while the back cover of each single was a piece to a puzzle, which could only be completed by purchasing all 12 singles. The same was done for the
obi strips, which contained a full image when arranged together in order. The track "
You" was composed by
music composer Toru Watanabe and performed by
arranger and
lyricist Yoko Kuzuya, who also worked on the lyrical portion with Kumi. The song carried elements of both pop and R&B, opening strong with a piano instrumental. "
D.D.D." featured the members and sisters of Japanese musical duo
Soulhead, Yoshika and Tsugumi, who also wrote and composed the piece, while the production was done by Octopussy. Musically, "D.D.D." is a
dance song that borrows numerous musical elements such as
R&B. The song borrows a 4-bar melody from the
Missy Elliott and
Rockwilder's remake of "
Lady Marmalade". "
Candy", which featured rapper Mr. Blistah from the
rap duo Clench & Blistah, was written and produced by Daisuke "D.I" Imai, who had worked with Kumi previously. Both Kumi and Mr. Blistah co-wrote the lyrics. "
Kamen" featured
Tatsuya Ishii from
Kome Kome Club, who had written the lyrics to the song alongside
Kazuhito Kikuchi. "
Shake It Up" was composed by Kim Hiroshi. The song contained mainly elements of pop, yet despite the
gothic theme, the song was about losing Yourself to music. "
Lies" was written and composed by musician and composer
Yanagiman, while Kumi wrote the lyrical portion. "
Birthday Eve" was written by Kosuke Morimoto. "
No Regret" was a blend of R&B and
electronic dance music. The music was composed and performed by
H-Wonder, who also performed the track "
Wind" (though the song was composed by Kousuke Morimoto), and the lyrics were written by Toru Watanabe. "
Ima Sugu Hoshii" was a cover of the
Sugar Soul song by the same name, originally released in January 1997 and later put on their album
Those Days. Sugar Soul's DJ Hasebe and Aiko Machida reproduced the single with Kumi, with the rap that Kumi performed in the bridge being a new addition – the rap lyrics were written by Japanese rapper
Zeebra. "
Someday" was written by Egami Kotaro and performed by tasuku, while Kumi wrote the lyrics. For "
Feel", Kumi worked closely with Hitoshi Shimono, who had previously written and composed her song "
24", and became her second song to have a chorus done in English. ==Special Single: Get It On==