The discography of Japanese contemporary R&B singer Crystal Kay consists of 12 studio albums, three extended plays, six compilation albums, four video albums and numerous single releases. Crystal Kay debuted as a singer at 13 years of age in 1999 under Epic Records Japan. Her third album Almost Seventeen (2002) saw a great leap in popularity for Crystal Kay, reaching number two on Oricon's albums chart. In 2005, Crystal Kay sang the eponymous theme song for the Tsuyoshi Kusanagi drama Koi ni Ochitara: Boku no Seikō no Himitsu. "Koi ni Ochitara" became Crystal Kay's most successful single, being certified for a million ringtone downloads.
In 2011, Crystal Kay signed to Delicious Deli Records, after 11 years with Epic Records, and released the album Vivid (2012). In March 2013 Crystal Kay relocated to New York City to pursue an American debut through Copetin Inc, releasing the single "Busy Doing Nothing" a year later. In October 2014, Crystal Kay re-focused on Japan by switching her management to LDH.
Studio albums
+ List of studio albums, with selected chart positions and certifications Title Album details Peak positions Sales Certifications JPN KOR Intl. TWN East Asia C.L.L Crystal Lover LightReleased: March 23, 2000 Label: Epic Formats: CD, digital download, streaming 60 — — JPN: 19,000 637: Always and ForeverReleased: August 22, 2001 Label: Epic Formats: CD, digital download, streaming 19 — — JPN: 49,000RIAJ: Gold Almost SeventeenReleased: October 23, 2002 Label: Epic Formats: CD, digital download, streaming 2 — — JPN: 354,000RIAJ: Platinum 4 RealReleased: November 27, 2003 Label: Epic Formats: CD, digital download, streaming 6 — — JPN: 246,000RIAJ: Platinum Crystal StyleReleased: March 2, 2005 Label: Epic Formats: CD, CD/DVD, digital download, streaming 2 — — JPN: 297,000RIAJ: Platinum Call Me Miss...Released: February 22, 2006 Label: Epic Formats: CD, CD/DVD, digital download, streaming 2 — — JPN: 251,000RIAJ: Platinum All YoursReleased: June 20, 2007 Label: Epic Formats: CD, CD/DVD, digital download, streaming 1 — 5 JPN: 137,000RIAJ: Gold Color Change!Released: August 6, 2008 Label: Epic Formats: CD, CD/2DVD, digital download, streaming 8 — — JPN: 100,000RIAJ: Gold Spin the MusicReleased: December 8, 2010 Label: Epic Formats: CD, digital download, streaming 42 40 — JPN: 10,000 VividReleased: June 27, 2012 Label: Delicious Deli Formats: CD, CD/DVD, digital download, streaming 35 — — JPN: 5,000 ShineReleased: December 16, 2015 Label: Delicious Deli Formats: CD, CD/DVD, CD/Blu-ray, digital download, streaming 10 — — JPN: 17,000 For YouReleased: June 13, 2018 Label: Virgin Formats: CD, CD/DVD, digital download, streaming 30 — — JPN: 4,000"—" denotes items which were released before the creation of the G-Music or Gaon charts, or items that did not chart.
Extended plays + List of extended plays, with selected chart positions Title Album details Peak positions Sales JPN ShiningReleased: November 28, 2007 Label: Epic Formats: CD, digital download, streaming 21 JPN: 12,000 FlashReleased: June 16, 2010 Label: Epic Formats: CD, CD/DVD, digital download, streaming 29 JPN: 6,000 Start Again EPReleased: February 24, 2023 Label: Virgin Formats: Digital download, streaming —"—" denotes items that did not chart.
Compilation albums + List of compilation albums, with selected chart positions and certifications Title Album details Peak positions Sales Certifications JPN Crystal KayAlbum compiling English language songs,released as Natural: World Premiere Album in Japan Released: November 7, 2003 Label: Epic Formats: CD, digital download, streaming 34 JPN: 30,000 CK5Released: June 30, 2004 Label: Epic Formats: CD, CD/DVD, digital download, streaming 2 JPN: 282,000RIAJ: Platinum Best of Crystal KayReleased: September 2, 2009 Label: Epic Formats: 2CD, 3CD, digital download, streaming 3 JPN: 156,000RIAJ: Gold The Best Remixes of CKReleased: December 16, 2009 Label: Epic Formats: CD, digital download, streaming 195 JPN: 1,000 Love Song BestReleased: December 14, 2011 Label: Epic Formats: CD, 2CD, digital download, streaming 81 JPN: 4,000 All Time Best 25th AnniversaryReleased: June 25, 2025 Label: Virgin, Sony Japan Formats: CD, digital download, streaming 39 JPN: 886
Cover albums + List of cover albums, with selected chart positions Title Album details Peak positions JPN I SingReleased: April 21, 2021 Label: Virgin Formats: CD, digital download, streaming 61
Soundtrack albums +List of soundtrack albums, with selected chart positions Title Album details A2Z(with Akihiro Manabe)Released: March 1, 2023 Label: Virgin Formats: CD, digital download, streaming
Singles As a lead artist + List of singles, with selected chart positions Title Year Peak chart positions Sales (JPN) Certifications Album JPN JPN HotThe Japan Hot 100 was established in February 2008. TWN East Asia "Eternal Memories" 1999 47 — — 20,000C.L.L Crystal Lover Light "Teenage Universe (Chewing Gum Baby)" 47 — — 13,000 80 — — 3,000 "Shadows of Desire" 2000 — — — "Girl's Night" 2001 100 — — 2,000637: Always and Forever "Ex-Boyfriend"(featuring Verbal) 44 — — 21,000 "Think of U" 60 — — 7,000Almost Seventeen "Hard to Say" 2002 26 — — 45,000 "Girl U Love" 156 — — 1,000 "Boyfriend (Part II)" 2003 3 40 — 133,000RIAJ (digital): Gold4 Real "I Like It"(with M-Flo) 8 — — 58,000 "Candy" 2 — — 15,000 "Can't Be Stopped" 146 — — 1,000 "Motherland" 2004 9 — — 43,000CK5 "Bye My Darling!" 40 — — 7,000Crystal Style "Kiss" 2005 10 — — 65,000RIAJ (cellphone): Gold 2 51 — 750,000RIAJ (ringtone): Million RIAJ (digital): 2× Platinum RIAJ (physical): Platinum RIAJ (streaming): GoldCall Me Miss... "Two as One"(with Chemistry) 2 — — 200,000RIAJ (cellphone): Gold RIAJ (physical): Gold "Kirakuni" ("Take It Easy") 2006 27 1 5 14,000 "Together" 12 2007 12 — — 20,000RIAJ (cellphone): GoldAll Yours 14 — — 17,000RIAJ (cellphone): Gold 30 — — 7,000 2008 42 29 — 4,000Color Change! "One" 32 20 — 7,000 "Girlfriend"(featuring BoA) 2009 31 57 — 4,000 Best of Crystal Kay "After Love (First Boyfriend)"(featuring Kaname of Chemistry) 20Spin the Music 2010 193 14 — 400 "Superman" 2011 55 7 — 3,000Vivid 2012 171 9 — 400 — "Forever" — 6 — "Busy Doing Nothing" 2014 — — — rowspan="3" "Rule Your World" — — — "Dum Ditty Dumb" — — — 2015 27 21 — 106,000RIAJ (digital): GoldShine "Revolution"(featuring Namie Amuro) 6 8 4 19,000 — 16 —100,000RIAJ (digital): Gold 2016 30 — — For You "Lovin' You" 149 — — "Faces" 2017 — — — 2018 — 80 — "Beautiful" 2019 — — — 2020 — — — I Sing — — — "I Love..." — — — 2021 — — — rowspan="6" "Say My Name"(with Tetsu) — — — "Just for One Night" (with Bsmntprty and Niko Brim) — — — "Gimme Some" (with Daichi Yamamoto)2022 — — — "No Pressure" (featuring VivaOla) — — — "Love Me" — — — "Start Again"2023 — — —Start Again EP & A2Z "How You Feel" — — — "Spark" — — — "That Girl"2024 — — —"—" denotes items which were released before the creation of the Billboard Japan Hot 100, or did not chart.
As a featured artist
+ List of singles, with selected chart positions Title Year Peak chart positions Sales (JPN) Album JPN JPN Hot "Lost Child"(Hiroshi Fujiwara and Shinichi Osawa featuring Crystal Kay) 2001 55 — 15,000 Satorare Original Soundtrack / 637: Always and Forever "Reeewind!"(M-Flo loves Crystal Kay) 2003 9 — 50,000 Astromantic "Universe"(BoA featuring Crystal Kay and Verbal of M-Flo) 2009 8 — 22,000 Best & USA (Shota Shimizu, Crystal Kay, Mummy-D, Seamo, Dohzi-T) 2010 — — Beat Connection "All You Need Is Love"(among Japan United with Music) 2012 11 11 26,000 "Answer"(with Tee) 77 16 1,000 Much Love "Where the Wild Things Are"(Far East Movement featuring Crystal Kay and Stereotypes) — — Dirty Bass "Physical"(Bradberry Orchestra featuring Suga Shikao, Crystal Kay and Salyu) — 72 "Fantastic Journey"(Daishi Dance featuring Crystal Kay) — — Wonder Tourism (among Dance Earth Party) 2013 5 5 20,000 "Rock City"(Exile Shokichi featuring Sway & Crystal Kay) 2016 — — The Future "Play That"(PKCZ featuring Hiroomi Tosaka, Crystal Kay & CRAZYBOY) 2017 — — 360° ChamberZ "Hot Like You (Fire)"(Freddy Browne featuring Jimmy Cozier & Crystal Kay) 2018 — — The Recipe (chay featuring Crystal Kay) 61 — Lavender"—" denotes items which were released before the creation of the Billboard Japan Hot 100 or did not chart.
Promotional singles
+ List of promotional singles, with selected chart positions Title Year Peak chart positions Album JPN Hot "Shining" 2007 — Shining "Step by Step" 2009 52 Best of Crystal Kay "Flash"2010 40 Flash "Time of Love" — Spin the Music "Take It Outside"2012 —Vivid "Memory Box" — "What We Do" — "My Heart Beat"2013 —rowspan="2" — "Very Special"(featuring Ryuji Imaichi (Sandaime J Soul Brothers from Exile Tribe) 2015 60 Shine "Rain on Me"(with Sumire, Tigarah & Ukico)2020 — "Steady"2021 —Speed Spirits"—" denotes items that were released before the creation of the Japan Hot 100, or did not chart.
Other appearances