The single contains "Moon Crying," the theme for the TV Asahi drama "Puzzle," "That Ain't Cool" featuring The Black Eyed Peas vocalist and singer Fergie, "Once Again," a song composed and produced by reggae artist Pushim, and "Lady Go!," a song that had been used for commercial advertisements by Visee Kosee, a cosmetic company, to promote the new product "Glamorous Hunter."
The music video for "That Ain't Cool," directed by Fatima Robinson, was shot in Atlanta, Georgia and made its premiere on May 29, 2008 on MTV Japan. An alternate version appears on her seventh studio album, Trick, which features some alternate shots and a bit more of a storyline.
The music video for "Moon Crying" made its premiere on May 30, 2008.
"Moon" had its daily debut at number 2 on the Oricon Daily Charts, with more than 26,000 copies in its first day. The following day, the single fell to number 3, then returned to number 2 the next day where it would remain for the rest of the week. "Moon" missed the number 1 position to Glay by only just 9,700 copies. However, it is her highest first week sales since "Freaky."
"Moon" is certified Gold by RIAJ for shipment of 100,000 copies. It is her last single to pass the 100,000 mark in Oricon sales to date. "Moon Crying" was certified triple platinum for 750,000 downloads in January 2014.