| Track Number | Track Title | Track Length | Track Price/Buy Link |
|---|---|---|---|
| 1 | HAPPY HAPPY | 3:27 | |
| 2 | The Best Thing I Ever Did (Japanese Version) (Japanese Version) | 3:33 | |
| 3 | HAPPY HAPPY (collapsedone Remix) (collapsedone Remix) | 3:33 | |
| 4 | HAPPY HAPPY (Instrumental) (Instrumental) | 3:28 |
- Duration:
- 14:01
- ℗ 2019 WARNER MUSIC JAPAN INC.
- © 2019 WARNER MUSIC JAPAN INC.
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