"Color of Soul" (stylized as COLOR OF SOUL) is the third Japan single by Japanese artist Kumi Koda. It charted #29 on Oricon and remained on the charts for XX weeks. The single became her first to contain a booklet with an inlay. It was her first single to not have a North American counterpart, whereas Kumi began to focus solely on the music industry in Japan.

Unlike her first two singles, which carried more elements of rhythm and blues, "Color Of Soul" was more pop oriented. The single contained one new song to the accompanying title track, "It's too late." Along with the b-side, two remixes of "Trust Your Love" were also included.

Color Of Soul is the third Japan single released by Japanese singer-songwriter Kumi Koda. This made her her fifth overall, having had released two singles exclusive to the United States. The single charted low on the Oricon Singles Charts, coming in at #29, and remained on the charts for XX consecutive weeks. It became her first single to include a booklet with an inlay. Unlike her first two singles, "Take Back" and "Trust Your Love," "Color Of Soul" was never given a release to the North American market, although Kumi had experienced success in the United States with both songs. Kumi later said how she wanted to focus solely on the Japanese market, wanting to become popular in her own country before branching out into other territories.

Despite have a darker cover, the title track became her first song to harbor predominately elements of pop music, unlike her previous singles which were predominately rhythm and blues. She utilized the latter for the single's coupling track "It's too late." Along with "It's too late," the single harbored two remixes of her previous single "Trust Your Love," both which had been unreleased.

"Color Of Soul" was written by famous musical composer Miki Watanabe, who has worked with the likes of SMAP, V6, AAA and YeLLOW Generation. Miki would later work with Kumi for her songs "Butterfly" and "Crazy 4 U," among others. The music for the track was performed by h-wonder, who debuted in 1995 as an artist, but became a composer in 1998. Since, he had worked with many avex artists and would continue to work with Kumi well into her later years, even performing the music for Kumi's cover of Linda Yamamoto's song "Dou ni mo Tomaranai" on her 2013 cover album Color The Cover. The lyrics to "Color Of Soul" were written by lyricist Natsumi Watanabe, who had worked on the lyrics for some of the music in the Pretty Soldier Sailor Moon anime series throughout the 1990s. Natsumi also worked with South Korean artist BoA on her 2004 studio album Love & Honesty.

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