Moon is the third full-length studio album released by Japanese solo artist Gackt on June 19, 2002. Instead of a booklet, the concept album comes with a printed note by the artist, asking readers to "sense" the record's story, rather than analyzing the lyrics. The booklet was eventually included in the packaging of Moon's 2003 follow-up Crescent. Both albums are linked, as well as his more recent albums Diabolos and Last Moon from the "Moon Saga".

Last Moon is the eighth full-length studio album by Japanese recording artist Gackt released on April 27, 2016 in Japan. As a concept album, it is considered to be the final, but not ending part of "Moon Saga", a conceptual story by which is linked to its predecessor albums Moon (2002), Crescent (2003), and Diabolos (2005), as well as the movie Moon Child (2003), theatre play Mysteries of Yoshitsune I&II (2012–2014), and two novels.