The members are:
・ Up-Front Egg:
- Arisa Noto (能登有沙)
・ SI☆NA (Up-Front Kansai):
- Suma Ai
- Iwashima Manami
- Abe Asami
・ HAPPY! STYLE Rookies:
- Rina Ichikawa
- Maho Matsunaga
・ Yui Ogura
・ Kaori Ishihara
・ Miruru Edagawa
・ Hitomi Terakado
Guest members:
・ ? Usagi
・ Shion Hirota
・ Irori Maeda (Hello! Pro Egg)
Former members:
・ Hina Aiba
・ Naoko Sakata
・ Nana Nakayama
Concerts:
・ 2008:
- May 6: "HAPPY! STYLE Communication Circuit 001", at Otomesando FAB
- July 7: "HAPPY!STYLE 2nd Communication Circuit 002", at Otomesando FAB
- September 7: "HAPPY! STYLE Communication Circuit 003", at Otomesando FAB
- October 13: "HAPPY! STYLE Communication Circuit 004", at Shibuya O-West
- December 23: "HAPPY! STYLE Xmas Special Talk LIVE "Tiny Xmas Fantasy"", at Pacific Heaven
・ 2009:
- February 15: "HAPPY! STYLE Communication Circuit 005", at Otomesando FAB
- May 6: "HAPPY! STYLE Communication Circuit 006", at Otomesando FAB
