Hapi☆Hapi Sunday! はぴ☆はぴ サンデー！
Released February 4, 2009 Editions 3 Tracks 2
Regular edition · Regular
| 1 | Hapi☆Hapi Sunday! | A-side |
| 2 | Hatten×JOY | B-side |
| 3 | Hapi☆Hapi Sunday! (Instrumental) |
Limited edition · Limited
| 1 | Hapi☆Hapi Sunday! | A-side |
| 2 | Hatten×JOY | B-side |
| 3 | Hapi☆Hapi Sunday! (Instrumental) |