Dai Nagao
To explain Hamasaki's the background and development, Hamasaki hosted a commentary on her website. The first song, "Rainbow", was originally composed by CMJK, but Hamasaki felt the finishing product was "missing something", and re-worked the demo version with Japanese musician Dai Nagao. According to Hamasaki, she wanted to reflect the emotion and words used in each 100,000 messages she received from her fans to create the song, but because there were numerous emails, she decided to write it as a summary and her feelings as an "aftermath" from reading the messages. The song was described by a staff member at "CD Journal" as an "organic midtempo pop ballad" song. "Appears" was remixed by Japanese group HΛL. According to Hamasaki, she had asked the group to re-compose their original version of the track in order to reflect "current [musical] themes of 2003."