
4 Real is fourth studio album by Japanese recording artist Crystal Kay. It was released via Sony Music Entertainment Japan on November 27, 2003, and was made available as a stand-alone CD and for digital consumption. The title 4 Real is play on the phrase "for real"—signifying the singer's fourth record. It contains primarily contemporary R&B influences and saw contributions from various songwriters and producers, including M-Flo, Yoshika and Keri Hilson, among others. The album spawned four singles, which were all released over the course of 2003.

637: Always and Forever is Crystal Kay's second album. It is her first R&B record; After the release of her debut album C.L.L Crystal Lover Light, Crystal started to move towards her new sound and made the transition with the single "Girl's Night". The album 637 features songs produced by well-known Japanese urban musicians Verbal, T-Kura, and Michico.

All Yours is the seventh studio album by the Japanese singer Crystal Kay, released by Sony Music Entertainment Japan on June 20, 2007.

Almost Seventeen is Crystal Kay's third album. It is her second R&B dominant album and is produced by a similar team as worked on 637: Always and forever. A large part of the record was written and produced by Michico and T-Kura of Giant Swing Productions. She also worked with the TinyVoice production company and Takahashi Taku from m-flo to produce "Hard to say". "Love Of A Lifetime" is a cover of a 1999 single by British girl group Honeyz. Crystal also released her ninth single "Girl U Love" alongside the album. The first pressings of Almost Seventeen were released at a lower price, and later prints received a new catalog number and a raised price.

Best of Crystal Kay is Crystal Kay's second greatest hits album. It was released on September 2, 2009. The release of this album marked the 10th anniversary of Kay's career in the music industry on the label Sony Music Entertainment Japan. This compilation consists of Kay's hit songs and more, as well as a third disc with new tracks.

The Best Remixes of CK is the first remix album by R&B and pop singer Crystal Kay. It was released on December 16, 2009 in Japan. The album contains remixes of various singles from Kay's career and includes remixes by popular Japanese producers such as Genki Rockets and Shinichi Osawa. The album contains three previously unreleased tracks including the "Oddity Remix" of "After Love", which had been used in commercials for Tully's Coffee earlier in the year.

C.L.L Crystal Lover Light is Crystal Kay's first album. The album was released when she was 14 years old. Unlike her later albums, this release contains other styles of music than urban pop, with several songs being acoustic and containing a blues vibe. The song "Shadows of Desire" was released as a single, simultaneously with the album. This album reached #60 on the weekly Oricon chart, and stayed on the chart for four weeks. In all, the album sold a total of 19,930 copies.

Call Me Miss... is the sixth studio album by Japanese recording artist Crystal Kay. This was released just two weeks after her previous single "Kirakuni / Together" and in two different versions: a regular CD only edition and a limited CD+DVD edition that comes with an orchestra version of "Kiss" as well as a DVD of the PVs and live performances of two of Kay's big hits, "Koi ni Ochitara" and "Two As One".

CK5 is a compilation album by Japanese contemporary R&B singer Crystal Kay, released on June 30, 2004. It commemorates the five years since her debut as a musician in 1999. On the same day, CK 99—04 Music Clips, a video album compiling her music videos was released.

Color Change! is Crystal Kay's eighth studio album and was released on August 6, 2008. The album peaked at #6 on the Oricon daily chart and at #8 on the weekly chart. The album includes songs produced by Jimmy Jam & Terry Lewis and Bloodshy & Avant. First pressings included a DVD which contained music videos for "Namida no Saki ni", "Shining" and "Dream World", from her previous album, All Yours. The title Color Change! refers to Kay's graduation in 2008. The album was eventually certified gold by RIAJ. Color Change! was the 289th best selling album of 2008 in Japan.

Crystal Kay is an album by Japanese R&B singer Crystal Kay. It compiles Crystal Kay's English language songs, and was released across Asia in November 2003. It was re-released in Japan on December 17, 2003, under the name Natural: World Premiere Album.

Crystal Style is Crystal Kay's fifth studio album. Unlike Crystal's last three albums, this record is more pop oriented and features more foreign producers, including Ashley Ingram and Jamelia. It was released in two different versions: a regular CD edition and a limited CD+DVD edition containing an English version of "MAKE YOU MINE", a DVD with her recent music videos, and a slipcase. There were only two singles released leading up to Crystal's Style.

Shine is the eleventh studio album by Japanese singer Crystal Kay. It was released on December 16, 2015, through Delicious Deli Records, and marked her first album release in three years since Vivid (2012).

Spin the Music is the ninth studio album by the Japanese singer Crystal Kay. It was released in Japan on December 8, 2010, and was her first studio album since Color Change! in 2008.

Vivid is the tenth Japanese language studio album by Japanese singer-songwriter Crystal Kay. This is her first album since her 2010 release Spin the Music. Also, this is her first album to be released under her new record label Universal after she left her long-time label Sony Music Japan in 2011.