This was made possible as Morning Musume and Tsunku♂ were appointed as the new endorsers for au's student discount campaign. The "formation" of this new group will be seen in the commercial that begins airing on the 24th.
Source:
http://www.au.kddi.com/mobile/campaign/gakuwari/mm/?sid=we-so-tw-morimusume-0122
http://livedoor.blogimg.jp/mashlife/imgs/d/8/d8c939a9-s.jpg
