| Official |
|---|
| 1.1 | ハピネス | 4:17 | AI | ハピネス | |
| 1.1 | Happiness | 4:17 | AI | Happiness | |
| 1.1 | ハピネス | 4:16 | AI | ハピネス / Letter In The Sky | |
| 1.3 | Happiness | 4:15 | AI | Independent | |
| 1.3 | ハピネス | 4:15 | AI | INDEPENDENT | |
| 1.3 | Happiness | 4:15 | AI | Independent | - 2012-02-24 XW
- 2012-02-24 US
|
| 1.3 | Happiness | 4:15 | AI | INDEPENDENT | |
| 1.3 | Happiness | 4:15 | AI | Independent | |
| 1.2 | Happiness | 4:17 | AI | Happiness - EP | |
| 1.3 | ハピネス | 4:16 | AI | INDEPENDENT | |
| 1.2 | ハピネス | 4:17 | AI | ハピネス - EP | |
| 1.1 | ハピネス | 4:17 | AI | ハピネス - ギフトパック | |
| 1.3 | ハピネス | 4:15 | AI | INDEPENDENT | |
| 1.1 | ハピネス | 4:17 | AI | ハピネス・パック | |
| 1.1 | ハピネス | 4:13 | AI | THE BEST | |
| 1.1 | ハピネス | ?:?? | AI | THE BEST | |
| 1.1 | ハピネス | 4:14 | AI | THE BEST | |
| 1.1 | ハピネス | 4:14 | AI | THE BEST | |
| 2.12 | ハピネス | 4:13 | AI | 感謝!!!!! -Thank you for 20 years NEW & BEST- | |
| 2.12 | ハピネス | 4:15 | AI | 感謝!!!!! -Thank You for 20 Years New and Best | |
| 2.12 | Happiness | ?:?? | AI | 感謝!!!!! - Thank You for 20 Years New and Best | |
| 1.1 | Happiness | 4:17 | AI | Happiness | |
| 1.3 | ハピネス | 4:13 | AI | 25th THE BEST - ALIVE | |
| 1.3 | ハピネス | 4:13 | AI | 25th THE BEST - ALIVE | |
| 1.3 | ハピネス | ?:?? | AI | 25th THE BEST - ALIVE | |
| 1.3 | ハピネス | 4:13 | AI | 25th THE BEST - ALIVE | |
| 1.3 | ハピネス | 4:13 | AI | 25th THE BEST - ALIVE | |
| 1.3 | ハピネス | 4:13 | AI | 25th THE BEST - ALIVE | |
| 1.3 | ハピネス | 4:13 | AI | 25th THE BEST - ALIVE | |
| 1.3 | ハピネス | 4:13 | AI | 25th THE BEST - ALIVE | |
| 1.3 | ハピネス | 4:13 | AI | 25th THE BEST - ALIVE | |
| 1.3 | ハピネス | 4:13 | AI | 25th THE BEST - ALIVE | |
| 1.3 | ハピネス | 4:13 | AI | 25th THE BEST - ALIVE | |
| 1.3 | ハピネス | ?:?? | AI | 25th THE BEST - ALIVE | |
| 1.3 | ハピネス | ?:?? | AI | 25th THE BEST - ALIVE | |
| 1.3 | ハピネス | ?:?? | AI | 25th THE BEST - ALIVE | |
| 1.1 | ハピネス | ?:?? | AI | ハピネス | - 2025-02-26 JP
- 2025-02-28 US
|
| 1.3 | ハピネス | ?:?? | AI | 25th THE BEST - ALIVE | |
| Promotion |
|---|
| 1.3 | ハピネス | 4:15 | AI | INDEPENDENT | |
| 1.3 | ハピネス | 4:16 | AI | INDEPENDENT | |
| Pseudo-Release |
|---|
| 1.3 | Happiness | 4:15 | AI | INDEPENDENT | |
| 1.3 | Happiness | 4:16 | AI | INDEPENDENT | |
| 1.3 | Happiness | ?:?? | AI | 25th THE BEST - ALIVE | |
| 1.3 | Happiness | ?:?? | AI | 25th THE BEST - ALIVE | |
| 1.3 | Happiness | ?:?? | AI | 25th THE BEST - ALIVE | |
| 1.3 | Happiness | ?:?? | AI | 25th THE BEST - ALIVE | |
| 1.3 | Happiness | 4:13 | AI | 25th THE BEST - ALIVE | |
| 2.12 | Happiness | 4:13 | AI | Kansha!!!!! -Thank You for 20 Years New and Best | |
| Withdrawn |
|---|
| 1.3 | Happiness | 4:15 | AI | Independent | |
