| 13/05/1995 | Precious Junk | |
 |
1. | Precious Junk |
| 2. | Orgel (オルゴール) | |
| 3. | Precious Junk (Instrumental) | |
| 21/06/1995 | Katahouzutsu no Earphone (片方ずつのイヤフォン) | |
 |
1. | Katahouzutsu no Earphone (片方ずつのイヤフォン) |
| 2. | Kakurenbo (かくれんぼ) | |
| 3. | Katahouzutsu no Earphone (片方ずつのイヤフォン) (Instrumental) | |
| 22/11/1995 | Yokogao (横顔) | |
 |
1. | Yokogao (横顔) |
| 2. | Ahiru (アヒル) | |
| 3. | Yokogao (横顔) (Original Karaoke) | |
| 21/08/1996 | Doshaburi (ドシャブリ) | |
 |
1. | Doshaburi (ドシャブリ) |
| 2. | Go Ahead | |
| 3. | Doshaburi (ドシャブリ) (Original Karaoke) | |
| 01/11/1996 | Stay With Me | |
 |
1. | Stay With Me |
| 2. | Sweet Room (スウィートルーム) | |
| 3. | Stay With Me (Instrumental) | |
| 01/11/1996 | Stay With Me (Reissue) | |
 |
1. | Stay With Me |
| 2. | Sweet Room (スウィートルーム) | |
| 3. | Stay With Me (Instrumental) | |
| 21/07/1997 | HEAT UP | |
 |
1. | HEAT UP |
| 2. | Catch Ball (キャッチボール) | |
| 3. | HEAT UP (Instrumental) | |
| 30/05/1998 | Love Love Love | |
 |
1. | Love Love Love |
| 2. | Tsuyoku Naritai (強くなりたい) | |
| 19/01/2000 | Rakuen (楽園) | |
 |
1. | Rakuen (楽園) |
| 2. | Affair | |
| 3. | What's Goin' On? | |
| 4. | Rakuen (楽園) (Birthday Mix) | |
| 19/01/2000 | Rakuen (楽園) (Reissue) | |
 |
1. | Rakuen (楽園) |
| 2. | Affair | |
| 3. | What's Goin' On? | |
| 4. | Rakuen (楽園) (Birthday Mix) | |
| 10/05/2000 | why | |
 |
1. | why |
| 2. | wonderful world | |
| 3. | why (CASSETTE VISION remix) | |
| 4. | wonderful world (KREVA remix feat. KREVA from KICK THE CAN CREW) | |
| 5. | why (Instrumental) | |
| 01/10/2000 | Precious Junk (Reissue) | |
 |
1. | Precious Junk |
| 2. | Orgel (オルゴール) | |
| 3. | Precious Junk (Instrumental) | |
| 01/10/2000 | Katahouzutsu no Earphone (片方ずつのイヤフォン) (Reissue) | |
 |
1. | Katahouzutsu no Earphone (片方ずつのイヤフォン) |
| 2. | Kakurenbo (かくれんぼ) | |
| 3. | Katahouzutsu no Earphone (片方ずつのイヤフォン) (Instrumental) | |
| 01/10/2000 | Yokogao (横顔) (Reissue) | |
 |
1. | Yokogao (横顔) |
| 2. | Ahiru (アヒル) | |
| 3. | Yokogao (横顔) (Original Karaoke) | |
| 01/10/2000 | Doshaburi (ドシャブリ) (Reissue) | |
 |
1. | Doshaburi (ドシャブリ) |
| 2. | Go Ahead | |
| 3. | Doshaburi (ドシャブリ) (Original Karaoke) | |
| 01/10/2000 | HEAT UP (Reissue) | |
 |
1. | HEAT UP |
| 2. | Catch Ball (キャッチボール) | |
| 3. | HEAT UP (Instrumental) | |
| 01/10/2000 | Love Love Love (Reissue) | |
 |
1. | Love Love Love |
| 2. | Tsuyoku Naritai (強くなりたい) | |
| 01/10/2000 | why (Reissue) | |
 |
1. | why |
| 2. | wonderful world | |
| 3. | why (CASSETTE VISION remix) | |
| 4. | wonderful world (KREVA remix feat. KREVA from KICK THE CAN CREW) | |
| 5. | why (Instrumental) | |
| 18/10/2000 | LOVE OR LUST | |
 |
1. | LOVE OR LUST |
| 2. | TABOO | |
| 3. | LOVE OR LUST (V.I.P. remix) | |
| 4. | TABOO (a tip of M-FLO remix) | |
| 5. | LOVE OR LUST (Instrumental) | |
| 18/10/2000 | LOVE OR LUST (Vinyl) | |
 |
1. | LOVE OR LUST |
| 2. | TABOO | |
| 3. | LOVE OR LUST (V.I.P. remix) | |
| 4. | TABOO (a tip of M-FLO remix) | |
| 5. | LOVE OR LUST (Instrumental) | |
| 06/12/2000 | even if | |
 |
1. | even if |
| 2. | GREEN CHRISTMAS | |
| 25/02/2001 | Miracles | |
 |
1. | Miracles |
| 2. | TUG OF WAR | |
| 3. | Miracles -K.H.'s Jazz (featuring TOKU)- | |
| 4. | TUG OF WAR -United Future Organization mix- | |
| 5. | Miracles (Instrumental) | |
| 16/05/2001 | KISS OF LIFE | |
 |
1. | KISS OF LIFE |
| 2. | CAT | |
| 3. | Miracles (SILENT POETS remix) | |
| 4. | KISS OF LIFE (Instrumental) | |
| 30/01/2002 | Missin' you ～It will break my heart～ | |
 |
1. | Missin' you ～It will break my heart～ |
| 2. | It will break my heart ～English version～ | |
| 3. | Missin' you ～It will break my heart～ (Instrumental) | |
| 4. | When Can I See You | |
| 5. | KISS OF LIFE (S.O.U.L. remix ＝Sound Of Urban London＝) | |
| 22/05/2002 | Strawberry Sex | |
 |
1. | Strawberry Sex |
| 2. | ex-girlfriend | |
| 3. | Missin' you ～It will break my heart～ (remix ascended) | |
| 4. | Strawberry Sex (Instrumental) | |
| 28/08/2002 | Ooki na Furudokei (大きな古時計) | |
 |
1. | Ooki na Furudokei (大きな古時計) |
| 2. | Grandfather's clock | |
| 3. | Ooki na Furudokei (大きな古時計) (less vocal) | |
| 4. | PAUL | |
| 07/11/2002 | Ring | |
 |
1. | Ring |
| 2. | somebody's girl | |
| 3. | Strawberry Sex ～Sweet Mix～ | |
| 4. | Ring (Instrumental) | |
| 08/05/2003 | LIFE is... ～another story～ | |
 |
1. | LIFE is... ～another story～ |
| 2. | Mabataki (まばたき) | |
| 3. | Come Back ～FILUR Deep Down & Low Remix～ | |
| 4. | LIFE is... ～another story～ (Instrumental) | |
| 30/07/2003 | style | |
 |
1. | style |
| 2. | signal | |
| 3. | You Are The Sunshine Of My Life | |
| 4. | style (Instrumental) | |
| 28/04/2004 | Hitomi wo Tojite (瞳をとじて) | |
 |
1. | Hitomi wo Tojite (瞳をとじて) |
| 2. | DESPERADO | |
| 3. | Hitomi wo Tojite (瞳をとじて) (Instrumental) | |
| 19/05/2004 | Kimi wa Tomodachi (キミはともだち) | |
 |
1. | Kimi wa Tomodachi (キミはともだち) |
| 2. | jealousy | |
| 3. | style (D.O.I. re-M.I.X.) | |
| 4. | Kimi wa Tomodachi (キミはともだち) (Instrumental) | |
| 06/10/2004 | Omoi ga Kasanaru Sono Mae ni... (思いがかさなるその前に・・・) | |
 |
1. | Omoi ga Kasanaru Sono Mae ni... (思いがかさなるその前に・・・) |
| 2. | Kimi wa Tomodachi (キミはともだち) (Soul Source Production Mix) | |
| 3. | Omoi ga Kasanaru Sono Mae ni... (思いがかさなるその前に・・・) (Instrumental) | |
| 26/10/2005 | POP STAR | |
 |
1. | POP STAR |
| 2. | Tameiki Kippu (ため息キップ) | |
| 3. | POP STAR (Instrumental) | |
| 14/06/2006 | Bye My Melody (バイマイメロディー) | |
 |
1. | Bye My Melody (バイマイメロディー) |
| 2. | hug | |
| 3. | Bye My Melody (バイマイメロディー) (Instrumental) | |
| 17/01/2007 | Aika (Elegy) (哀歌（エレジー）) | |
 |
1. | Aika (Elegy) (哀歌（エレジー）) |
| 2. | Kiss | |
| 3. | POP STAR (winter lover version) | |
| 4. | Aika (Elegy) (哀歌（エレジー）) (Instrumental) | |
| 28/02/2007 | Kimi no Suki na Toko (君の好きなとこ) | |
 |
1. | Kimi no Suki na Toko (君の好きなとこ) |
| 2. | Utsukushii Hito (美しい人) | |
| 3. | By My Melody (HALFBY's music for momo REMIX) | |
| 4. | Kimi no Suki na Toko (君の好きなとこ) (Instrumenta) | |
| 12/09/2007 | fake star | |
 |
1. | fake star |
| 2. | fake star ~Ken's swingin' jazz~ | |
| 3. | POP STAR×fake star (MASH UP version) | |
| 4. | fake star (instrumental) | |
| 20/02/2008 | Canvas (キャンバス) / Kimi wa su-te-ki ♡ (君はス・テ・キ♡) | |
 |
1. | Canvas (キャンバス) |
| 2. | Kimi wa su-te-ki ♡ (君はス・テ・キ♡) | |
| 3. | Cry&Smile!! | |
| 4. | Canvas (キャンバス) (piano version) | |
| 5. | Canvas (キャンバス) (Instrumental) | |
| 6. | Kimi wa su-te-ki ♡ (君はス・テ・キ♡) (Instrumental) | |
| 23/04/2008 | Itsuka Hanareru Hi Ga Kitemo (いつか離れる日が来ても) | |
 |
1. | Itsuka Hanareru Hi Ga Kitemo (いつか離れる日が来ても) |
| 2. | Itsuka Hanareru Hi Ga Kitemo (いつか離れる日が来ても) (Instrumental) | |
| 23/09/2009 | CANDY | |
 |
1. | CANDY |
| 2. | Furusa Saiida (フルサ・サイーダ) | |
| 3. | Do it!! | |
| 4. | CANDY (Instrumental) | |
| 21/10/2009 | Boku wa Kimi ni Koi wo Suru (僕は君に恋をする) (CD) | |
 |
1. | Boku wa Kimi ni Koi wo Suru (僕は君に恋をする) |
| 2. | Hitori Janai (一人じゃない) | |
| 3. | Catch you | |
| 4. | Boku wa Kimi ni Koi wo Suru (僕は君に恋をする) (Instrumental) | |
| 21/10/2009 | Boku wa Kimi ni Koi wo Suru (僕は君に恋をする) (CD+DVD) | |
 |
1. | Boku wa Kimi ni Koi wo Suru (僕は君に恋をする) |
| 2. | Hitori Janai (一人じゃない) | |
| 3. | Catch you | |
| 4. | Boku wa Kimi ni Koi wo Suru (僕は君に恋をする) (Instrumental) | |
| DVD: | ||
| 1. | Ken's Bar 10th Anniversary 'Ken's Bar II' Release Special Party! concert | |
| 13/10/2010 | Sing Forever (CD) | |
 |
1. | Sing Forever |
| 2. | HOTEL VAMPIRE | |
| 3. | Taiyou (太陽) | |
| 4. | CANDY (Suspicious Remix) | |
| 5. | Sing Forever (Instrumental) | |
| 13/10/2010 | Sing Forever (CD+EXTRA) | |
 |
1. | Sing Forever |
| 2. | HOTEL VAMPIRE | |
| 3. | Taiyou (太陽) | |
| 4. | CANDY (Suspicious Remix) | |
| 5. | Sing Forever (Instrumental) | |
| - | CD EXTRA: | |
| 6. | 15th anniversary footage | |
| 10/11/2010 | Aishiteru (アイシテル) | |
 |
1. | Aishiteru (アイシテル) |
| 2. | air cameraman | |
| 3. | Unchained Melody | |
| 4. | Boku wa Kimi ni Koi wo Suru (僕は君に恋をする) (rei harakami remix) | |
| 5. | Aishiteru (アイシテル) (Instrumental) | |
| 10/11/2010 | Aishiteru (アイシテル) (CD+EXTRA) | |
 |
1. | Aishiteru (アイシテル) |
| 2. | air cameraman | |
| 3. | Unchained Melody | |
| 4. | Boku wa Kimi ni Koi wo Suru (僕は君に恋をする) (rei harakami remix) | |
| 5. | Aishiteru (アイシテル) (Instrumental) | |
| - | CD+EXTRA: | |
| 6. | Ken Hirai 15th Anniversary Special!! Vol.3 Ken's Bar in N.Y. LIVE MOVIE、 | |
| 7. | Sing Forever (PV) | |
| 04/05/2011 | Itoshiki Hibi yo (いとしき日々よ) (CD) | |
|
1. | Itoshiki Hibi yo (いとしき日々よ) |
| 2. | Run to you | |
| 3. | Itoshiki Hibi yo (いとしき日々よ) (Instrumental) | |
| 30/05/2012 | Kokuhaku (告白) (CD) | |
|
1. | Kokuhaku (告白) |
| 2. | Woman "W no Higeki" Yori (Woman "Wの悲劇"より) | |
| 3. | Itoshiki Hibi yo ~the repose of souls~ (いとしき日々よ ~the repose of souls~) | |
| 4. | Onegai Jury☆ -Hyadain no Riririri☆remix- (お願いジュリー☆ -ヒャダインのリリリリ☆リミックス-) | |
| 5. | Kokuhaku (告白) (Instrumental) | |
| 30/05/2012 | Kokuhaku (告白) (CD+DVD) | |
|
1. | Kokuhaku (告白) |
| 2. | Woman "W no Higeki" Yori (Woman "Wの悲劇"より) | |
| 3. | Kokuhaku (告白) (Instrumental) | |
| DVD: | ||
| 1. | KEN HIRAI TV | |
| 23/10/2013 | Kikyougaoka (桔梗が丘) (Digital) | |
|
1. | Kikyougaoka (桔梗が丘) |
| 02/04/2014 | Grotesque (グロテスク) feat. Amuro Namie (CD) | |
|
1. | Grotesque (グロテスク) feat. Amuro Namie |
| 2. | Kikyougaoka (桔梗が丘) | |
| 3. | Aozora Sanka (青空傘下) | |
| 02/04/2014 | Grotesque (グロテスク) feat. Amuro Namie (CD+DVD A) | |
|
1. | Grotesque (グロテスク) feat. Amuro Namie |
| 2. | Grotesque (グロテスク) feat. Amuro Namie (Instrumental) | |
| DVD: | ||
| 1. | Grotesque (グロテスク) feat. Amuro Namie (PV) | |
| 02/04/2014 | Grotesque (グロテスク) feat. Amuro Namie (CD+DVD B) | |
|
1. | Grotesque (グロテスク) feat. Amuro Namie |
| 2. | Kikyougaoka (桔梗が丘) | |
| DVD: | ||
| 1. | KEN HIRAI TV Vol.2 | |
| 29/10/2014 | Onnaji Samishisa (おんなじさみしさ) (Digital) | |
|
1. | Onnaji Samishisa (おんなじさみしさ) |
| 10/12/2014 | Soredemo Shitai (ソレデモシタイ) / Onnaji Samishisa (おんなじさみしさ) (CD) | |
|
1. | Soredemo Shitai (ソレデモシタイ) |
| 2. | Onnaji Samishisa (おんなじさみしさ) | |
| 3. | Zankyou (残響) | |
| 4. | Tomorrow | |
| 5. | Soredemo Shitai (ソレデモシタイ) (Instrumental) | |
| 6. | Onnaji Samishisa (おんなじさみしさ) (Instrumental) | |
| 10/12/2014 | Soredemo Shitai (ソレデモシタイ) / Onnaji Samishisa (おんなじさみしさ) (CD+DVD) | |
|
1. | Soredemo Shitai (ソレデモシタイ) |
| 2. | Onnaji Samishisa (おんなじさみしさ) | |
| DVD: | ||
| 1. | Soredemo Shitai (ソレデモシタイ) (PV) | |
| 2. | Soredemo Shitai (ソレデモシタイ) (Making of) | |
| 19/07/2015 | Kimi no Kodou wa Kimi ni Shika Narasenai (君の鼓動は君にしか鳴らせない) (Digital Short Size) | |
|
1. | Kimi no Kodou wa Kimi ni Shika Narasenai (君の鼓動は君にしか鳴らせない) (drama ver.) |
| 05/08/2015 | Kimi no Kodou wa Kimi ni Shika Narasenai (君の鼓動は君にしか鳴らせない) (CD) | |
|
1. | Kimi no Kodou wa Kimi ni Shika Narasenai (君の鼓動は君にしか鳴らせない) |
| 2. | Ai ni Kodaware (愛にこだわれ) | |
| 3. | Soredemo Shitai (ソレデモシタイ) (tofubeats remix) | |
| 4. | Ken Hirai 20th Anniversary Mega Mix vol.1 | |
| 05/08/2015 | Kimi no Kodou wa Kimi ni Shika Narasenai (君の鼓動は君にしか鳴らせない) (CD+DVD) | |
|
1. | Kimi no Kodou wa Kimi ni Shika Narasenai (君の鼓動は君にしか鳴らせない) |
| 2. | Kimi no Kodou wa Kimi ni Shika Narasenai (君の鼓動は君にしか鳴らせない) (Instrumental) | |
| DVD: | ||
| 1. | KEN HIRAI TV Vol.3 "20th Anniversary Special Long Interview -Zenpen- | |
| 25/05/2016 | Plus One / TIME (CD) | |
|
1. | Plus One |
| 2. | TIME | |
| 3. | Ken Hirai 20th Anniversary Mega Mix Vol.2 | |
| 4. | Plus One (Instrumental) | |
| 5. | TIME (Instrumental) | |
| 25/05/2016 | Plus One / TIME (CD+DVD) | |
|
1. | Plus One |
| 2. | TIME | |
| DVD: | ||
| 1. | KEN HIRAI TV Vol.5 "Utabaka Ken Sanpo in Iseshima" | |
| 22/06/2016 | Mahotte Itte Ii Kana? (魔法って言っていいかな？) (CD+DVD) | |
|
1. | Mahotte Itte Ii Kana? (魔法って言っていいかな？) |
| 2. | I'myourdog | |
| 3. | Plus One (KSUKE Remix) | |
| 4. | Mahotte Itte Ii Kana? (魔法って言っていいかな？) (Instrumental) | |
| 01/03/2017 | Boku no Kokoro wo Tsukutte yo (僕の心をつくってよ) (CD) | |
|
1. | Boku no Kokoro wo Tsukutte yo (僕の心をつくってよ) |
| 2. | YUMING | |
| 3. | Ho (ほっ) | |
| 01/03/2017 | Boku no Kokoro wo Tsukutte yo (僕の心をつくってよ) (CD Anime Edition) | |
|
1. | Boku no Kokoro wo Tsukutte yo (僕の心をつくってよ) |
| 2. | Boku no Kokoro wo Tsukutte yo (僕の心をつくってよ) (Instrumental) | |
| 01/03/2017 | Boku no Kokoro wo Tsukutte yo (僕の心をつくってよ) (CD+DVD) | |
|
1. | Boku no Kokoro wo Tsukutte yo (僕の心をつくってよ) |
| 2. | Boku no Kokoro wo Tsukutte yo (僕の心をつくってよ) (Instrumental) | |
| DVD: | ||
| 1. | KEN HIRAI TV Vol.6 「KEN PLAY BACK 2016」 | |
| 07/06/2017 | Non Fiction (ノンフィクション) (CD Regular Edition) | |
|
1. | Non Fiction (ノンフィクション) |
| 2. | Brand New Bike | |
| 3. | Mahotte Itte Ii Kana? (魔法って言っていいかな？) (VaVa Remix) | |
| 07/06/2017 | Non Fiction (ノンフィクション) (CD Limited Edition) | |
|
1. | Non Fiction (ノンフィクション) |
| 2. | Non Fiction (ノンフィクション) (Instrumental) | |
| - | 【Bonus Track】 | |
| - | 2017 Special Live!! 「THE STILL LIFE」 at Budokan April 2017: | |
| 3. | style | |
| 4. | Soredemo Shitai (ソレデモシタイ) | |
| 5. | Mahotte Itte Ii Kana? (魔法って言っていいかな？) | |
| 6. | Unfit In love | |
| 7. | Boku no Kokoro wo Tsukutte yo (僕の心をつくってよ) | |
| 8. | Ho (ほっ) | |
| 9. | Missionary | |
| 10. | Kawaii no Youkai (かわいいの妖怪) | |
| 11. | KISS OF LIFE | |
| 12. | Non Fiction (ノンフィクション) | |
| 30/05/2018 | Todokanai Kara (トドカナイカラ) (CD Limited Edition) | |
|
1. | Todokanai Kara (トドカナイカラ) |
| 2. | Todokanai Kara (トドカナイカラ) (Instrumental) | |
| - | Ken’s Bar 20th Anniversary Bonus Track | |
| - | Ken's Bar 2017 X'mas Special!! | |
| 3. | Mahotte Itte Ii Kana? (魔法って言っていいかな？) | |
| 4. | Sentimental (センチメンタル) | |
| 5. | Aika (Elegy) (哀歌（エレジー）) | |
| 30/05/2018 | Shiranaindesho? (知らないんでしょ?) (CD Limited Edition) | |
|
1. | Shiranaindesho? (知らないんでしょ?) |
| 2. | Shiranaindesho? (知らないんでしょ?) (Instrumental) | |
| - | Ken's Bar 20th Anniversary Bonus Track/Ken's Bar 2017 X'mas Special!!: | |
| 3. | Kimi wa Tomodachi (キミはともだち) | |
| 4. | Strawberry Sex | |
| 5. | Non Fiction (ノンフィクション) | |
| 28/11/2018 | half of me (CD) | |
|
1. | half of me |
| 2. | HOLIC | |
| 3. | even if (everlasting ver.) | |
| 28/11/2018 | half of me (CD+DVD) | |
|
1. | half of me |
| 2. | half of me (Instrumental) | |
| DVD: | ||
| 1. | half of me (MV) | |
| 2. | half of me (Making of) | |
| 28/11/2018 | half of me (Digital) | |
|
1. | half of me |
| 2. | HOLIC | |
| 3. | even if (everlasting ver.) | |
| 4. | half of me (Instrumental) | |
| 29/05/2019 | Ite mo Tatte mo (いてもたっても) (Digital) | |
|
1. | Ite mo Tatte mo (いてもたっても) |
| 04/12/2019 | #302 (CD) | |
|
1. | #302 |
| 2. | Kawai Souda yo ne (かわいそうだよね) | |
| 3. | Todokanai Kara (トドカナイカラ)（Kan Sano Remix） | |
| 04/12/2019 | #302 (CD+DVD) | |
|
1. | #302 |
| 2. | #302 (Instrumental) | |
| DVD: | ||
| 1. | #302 (MV) | |
| 2. | Ite mo Tatte mo (いてもたっても) (MV) | |
| 04/12/2019 | #302 (Digital) | |
 |
1. | #302 |
| 2. | Kawai Souda yo ne (かわいそうだよね) | |
| 3. | Todokanai Kara (トドカナイカラ) (Kan Sano Remix) | |
| 4. | #302 (Instrumental) | |
| 26/03/2020 | Kaibutsu-san (怪物さん) feat.Aimyon (Digital) | |
|
1. | Kaibutsu-san (怪物さん) feat.Aimyon |
| 06/02/2013 | Toko Furuuchi - Sayonara Restaurant (さよならレストラン) feat. Ken Hirai (Digital) | |
|
1. | Sayonara Restaurant (さよならレストラン) feat. Ken Hirai |
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