| 2hot2eat | Osamu Kubota | | 2.75 | 1:52 | |
| 1989 | Osamu Kubota | | 3.5 | 1:38 | |
| A Midnight Hymn (O Come, O Come, Emmanuel) | Osamu Kubota | | | 3:55 | |
| A Reading Man ～ 読む男 | Osamu Kubota | | | 4:36 | |
| A Voyage to Nowhere | Osamu Kubota | | | 5:34 | |
| Aria de Coimbra | 久保田修 | | | 4:26 | |
| avant-guerre | Osamu Kubota | | 2.5 | 2:02 | |
| Beyond the Mountains | 久保田修 | | | 4:33 | |
| Broken Hourglass | good-cool feat. Osamu Kubota | | | 5:08 | |
| Carezza | Osamu Kubota | | 3.25 | 1:50 | |
| Carezza | Osamu Kubota | | | 1:49 | |
| City of Mirrors | Osamu Kubota feat. Ffion Elisa | | 3.6 | 2:22 | |
| Consolation | 久保田修 | | | 2:23 | |
| Dernier Sourire | 久保田修 | | | 2:01 | |
| die Fuge | 久保田修 | | | 3:11 | |
| Discipline | 久保田修 | | | 4:09 | |
| Doigts de Fatima -ファティマの掌- | Osamu Kubota featuring Sizzle Ohtaka | | 2.75 | 1:50 | |
| Estella | Osamu Kubota | | 3.25 | 1:42 | |
| Estella | Osamu Kubota | | | 1:43 | |
| Everlasting Message / ぺのれり | Osamu Kubota | | 3 | 4:06 | |
| Fame or die | 久保田修 | | | 3:38 | |
| First Light | Osamu Kubota | | | 4:43 | |
| Five Regrets | Osamu Kubota | | 3.25 | 1:38 | |
| foreplay | Osamu Kubota | | 3.25 | 1:28 | |
| Galician Carol | Osamu Kubota | | | 3:25 | |
| Golden Horn (premium version) | Osamu Kubota | | 3 | 3:03 | |
| Ice symphony | 久保田修 | | | 4:47 | |
| Je t'embrasse | 久保田修 | | | 2:29 | |
| L’épisode | Osamu Kubota | | 2.75 | 2:34 | |
| Larmes Do La Lune | 久保田修 | | | 3:57 | |
| Le Cantïque (O Holy Night) | Osamu Kubota | | | 3:26 | |
| Le Swing | 閣下・Zektbach・少年ラジオ remixed by Osamu Kubota | | | 10:12 | |
| Liberation | 久保田修 | | | 3:02 | |
| Libra Negra | 久保田修 | | | 5:30 | |
| Limerence | Osamu Kubota | | | 4:55 | |
| Maya | 久保田修 | | | 4:13 | |
| Mes Petites Inventions | 久保田修 | | | 3:28 | |
| mind the gap | Osamu Kubota | | 3 | 1:54 | |
| Neige a Saigon | 久保田修 | | | 3:03 | |
| Note d'Azur (long version) | Osamu Kubota | | 3.35 | 3:00 | |
| Odyssey | 久保田修 | | | 3:39 | |
| Old Speckled Reel | 久保田修 | | | 2:51 | |
| Patrick's Wings | 久保田修 | | | 4:04 | |
| Piosenka | 久保田修 | | | 4:00 | |
| Presto | Osamu Kubota | | 3 | 1:41 | |
| Presto | Osamu Kubota | | | 1:42 | |
| Red Nikita | Osamu Kubota | | 3.25 | 1:31 | |
| Rhapsody | 久保田修 | | | 4:18 | |
| Sanctus | Osamu Kubota | | 2.5 | 1:36 | |
| Sanctus | 久保田修 | | | 0:42 | |
| Scandal | Osamu Kubota | | 2 | 2:12 | |
| Scandal | Osamu Kubota | | 3.5 | 2:15 | |
| scherzo | Osamu Kubota | | 2.75 | 1:43 | |
| Silent Night | Osamu Kubota | | | 3:25 | |
| Siren's Scent | 久保田修 | | | 4:45 | |
| Some Small Hope (Cherubic Hymn by A. Kastorsky) | Osamu Kubota | | | 3:05 | |
| Temptation | 久保田修 | | | 4:21 | |
| The First Noel | Osamu Kubota | | | 3:35 | |
| The Shepherd’s Carol | Osamu Kubota | | | 2:51 | |
| Vienna | Osamu Kubota | | 3 | 1:38 | |
| Voca Nostalgia (+minne) | Osamu Kubota | | 3 | 4:47 | |
| Vyshegrad - Valse d'Auch | 久保田修 | | | 3:45 | |
| もうひとつの蠍火 〜象牙と羊腸と肉声のための変奏曲 | Osamu Kubota | | | 5:06 | |
| 冥 / Amuro vs Killer | Osamu Kubota、TaQ | | 3 | 5:08 | |
| 嘆きの樹 (BEMANI SYMPHONY Arr.) | 金獅子 × Nagiha & Osamu Kubota + gaQdan | | | 2:07 | |
| 嘆きの樹 / 金獅子 | Nagiha / Osamu Kubota | | 2.5 | 5:09 | |
| 嘆きの樹 Arbre triste -a la viennoise- | Osamu Kubota | | | 3:38 | |
| 惑 -perplexity- | Osamu Kubota | | 3.25 | 1:57 | |
| 量子の海のリントヴルム / 黒猫ダンジョン | Osamu Kubota | | 3 | 3:59 | |
