| 16/2/2011 | Sisyphus (Digital Single) | |
|
1. | Sisyphus (Spanish version) |
| 2. | Cuando se ama | |
| 4/5/2011 | U (CD) | |
|
1. | Sisyphus |
| 2. | U | |
| 3. | Heart of glass | |
| 4. | Cuando se ama | |
| 5. | Sisyphus (Instrumental) | |
| 6. | U (Instrumental) | |
| 7. | Heart of glass (Instrumental) | |
| 4/5/2011 | U (CD+DVD A) | |
|
1. | Sisyphus |
| 2. | U | |
| 3. | Heart of glass | |
| 4. | Sisyphus (Instrumental) | |
| 5. | U (Instrumental) | |
| 6. | Heart of glass (Instrumental) | |
| DVD: | ||
| 1. | Sisyphus (PV) | |
| 2. | U (PV) | |
| 3. | Off-shot | |
| 4/5/2011 | U (CD+DVD B) | |
|
1. | Sisyphus |
| 2. | U | |
| 3. | Heart of glass | |
| 4. | Sisyphus (Instrumental) | |
| 5. | U (Instrumental) | |
| 6. | Heart of glass (Instrumental) | |
| DVD: | ||
| 1. | Heart of glass (PV) | |
| 2. | U (PV) | |
| 3. | Off-shot | |
| 7/9/2011 | Setsuna ～a sandglass of fate～ (刹那～a sandglass of fate～) (CD) | |
|
1. | Setsuna ～a sandglass of fate～ (刹那～a sandglass of fate～) |
| 2. | La flor abandonada | |
| 3. | Love & Peace | |
| 4. | Setsuna ～a sandglass of fate～ (刹那～a sandglass of fate～) (Instrumental) | |
| 5. | La flor abandonada (Instrumental) | |
| 6. | Love & Peace (Instrumental) | |
| 7/9/2011 | Setsuna ～a sandglass of fate～ (刹那～a sandglass of fate～) (CD+DVD A) | |
|
1. | Setsuna ～a sandglass of fate～ (刹那～a sandglass of fate～) |
| 2. | La flor abandonada | |
| 3. | Love & Peace | |
| 4. | Setsuna ～a sandglass of fate～ (刹那～a sandglass of fate～) (Instrumental) | |
| 5. | La flor abandonada (Instrumental) | |
| 6. | Love & Peace (Instrumental) | |
| DVD: | ||
| 1. | Setsuna ～a sandglass of fate～ (刹那～a sandglass of fate～) (PV) | |
| 7/9/2011 | Setsuna ～a sandglass of fate～ (刹那～a sandglass of fate～) (CD+DVD B) | |
|
1. | Setsuna ～a sandglass of fate～ (刹那～a sandglass of fate～) |
| 2. | La flor abandonada | |
| 3. | Love & Peace | |
| 4. | Setsuna ～a sandglass of fate～ (刹那～a sandglass of fate～) (Instrumental) | |
| 5. | La flor abandonada (Instrumental) | |
| 6. | Love & Peace (Instrumental) | |
| DVD: | ||
| 1. | U Special Interview | |
| 22/2/2012 | Worth Fighting For feat.HOWIE D (CD) | |
|
1. | Worth Fighting For feat.HOWIE D |
| 2. | Campeones | |
| 3. | It was you | |
| 4. | Worth Fighting For feat.HOWIE D (Instrumental) | |
| 5. | Campeones (Instrumental) | |
| 22/2/2012 | Worth Fighting For feat.HOWIE D (CD+DVD) | |
|
1. | Worth Fighting For feat.HOWIE D |
| 2. | Campeones | |
| 3. | It was you | |
| 4. | Worth Fighting For feat.HOWIE D (Instrumental) | |
| 5. | Campeones (Instrumental) | |
| DVD: | ||
| 1. | Worth Fighting For feat.HOWIE D (PV) | |
| 11/3/2013 | Inori no Kotodama (祈りの言霊) (Digital) | |
|
1. | Inori no Kotodama (祈りの言霊) |
| 19/06/2020 | even if (Digital) | |
 |
1. | even if |
| 30/10/2024 | Yume no Tane〜I'll be by your side (夢の種〜I'll be by your side) (Digital) | |
 |
1. | Yume no Tane〜I'll be by your side (夢の種〜I'll be by your side) |
| 12/10/2011 | Howie D - If I Say feat. U (Digital Single) | |
|
1. | If I Say feat. U |
| 25/3/2015 | Yume wa Hisoka ni (夢はひそかに) (Duet version) (Mitsuki Takahata & Yu Shirota) (Digital) | |
|
1. | Yume wa Hisoka ni (夢はひそかに) (Duet version) |
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