Released on Koda Kumi's 2006 album Black Cherry, Tsuki to Taiyou is a defining track of her early pop career. The song exemplifies the J-pop sound of the mid-2000s, blending catchy melodies with emotional lyrics that explore contrasting themes of light and darkness. As a lead single from the album, it showcased Kumi's vocal range and her ability to craft anthemic pop songs that resonated with a wide audience. The recording stands as a significant song in her discography, reflecting the polished production style and youthful energy characteristic of her work during this pivotal era in her career.