Moon (stylized as MOON) is the fortieth single released in Japan by soloist Koda Kumi. Much like her past summer single Freaky and 4 hot wave, Moon carried four songs. It charted at #2 on Oricon and stayed on the charts for nineteen weeks. It was released in CD and CD+DVD editions, with the limited editions of both versions carrying an alternate rendition of "Moon Crying."

Moon is Japanese singer-songwriter Kumi Koda's fortieth single. It charted at #2 on the weekly Oricon Singles Charts and remained on the charts for nineteen weeks.

The single became Kumi's first to be released after the controversy in late January of that same year. On January 30, Kumi made an inflammatory statement on All Night Nippon when asked about whether or not she wanted her then-manager to have children, whereas her manager had just gotten married. She had responded, "When women turn 35, their amniotic fluid goes rotten, so I hope they have a child before then." Her website had been shut down with a letter from Kumi posted on the page, apologizing for her remark. Due to the controversy, it was speculated that any following singles would not chart well, if she chose to continue releasing music.

Kumi had gone to say how the song's lyrics and overall tone were written as an apology and to reflect how much she had regretted the statement.

The single continued on with the theme of releasing a summer single with four songs, following 4 hot wave (2006) and Freaky (2007). However, although the single carried four different musical tracks, it was only a double a-side with music videos only being released for "Moon Crying" and "That Ain't Cool."

For "Moon Crying," Kumi worked closely with musical composer h-wonder. The two had worked together several times in the past, beginning with her debut single Take Back in 2000.

"That Ain't Cool" featured American singer-songwriter Fergie from the hip-hop/pop group The Black Eyed Peas. Although both Kumi and Fergie were listed as the writers for the song, the song was mainly written by Fergie, who presented the song as a gift to Kumi upon meeting the artist.

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