At around 22:00 local time on 16 Sep, YuiKaori's management agency,
Style Cube, announced at their blog that Ogura Yui and Ishihara Kaori
have left the agency.

At roughly the same time, both Yui and Kaori posted in their separate
blog that they will both be joining Sigma Seven starting 17 Sep.

Ref :
Style Cube announcement
http://stylecubeinfo.blogspot.jp/2013/09/blog-post_16.html
Kaori blog
http://ameblo.jp/ishiharakaori/entry-11615086793.html
Yui blog
http://ameblo.jp/ogura-yui/entry-11615089086.html


-- 
'CuSO4' Yung