So this song keeps popping up every time I go with a Japanese person to karaoke. I think because of the whole dance-a-long thing, because when it is sung everyone is determined to dance it as well, even if they don't know it.
I also had a girl tell me that she wanted it played at the reception for her wedding
I just found it interesting since I thought the song was a little weak as well (though admittedly I don't really follow their music too much) It was promoted a TON though. Stuff is still all over the place for it and it was months ago.