[SOLVED] Super fast J-pop song

i need help with finding a song title...it has a bunch of girls singing super fast, the words are too fast to type but they're yelling this:

"egao, egao"

it sounds a lot like akb48...but i don't know how to find the title ;-;

please help, here's a video --- http://youtu.be/9sBdKeKuK0w

The Peach Black Clan - Nippon Egao Hyakkei

http://www.youtube.com/watch?v=Cw8scGkh9ls

thanks