Help identifying a group?

[JesA]

My friend has been getting into Japanese music with people like BoA and Miyavi *haha diversity is always good* and he asked me about this group..im kinda a reference for Asia at my school...he described this one video/song as:

*there were about 4 to 6 girls
*all were in white
*they were dancing in a white cube
*the song title had the word "angel" in it

i had no idea who it could be...the only girl groups i know of are the H!P groups, DREAM, and Day After Tomorrow. can anyone help my friend? who is this?