Hajimete no Happy Birthday! 初めてのハッピーバースディ！
Released April 18, 2001 Editions 1 Tracks 2
Regular edition · Regular
| 1 | Hajimete no Happy Birthday! | A-side |
| 2 | Hajimete no Happy Birthday! | B-side |
| 3 | Hajimete no Happy Birthday! (Instrumental) |
Participants
Facts
First single to feature Ishikawa Rika.