Yogurtt
I don't really know who's who there... can You mention who's who in that picture? (at least the hair color)
In response for Yogurtt:
In order
http://puu.sh/9purx/f22619193d.jpg Akari
http://puu.sh/9purR/1e72a258bb.jpg Yui
http://puu.sh/9pusa/9c909d0480.jpg Kyouko
http://puu.sh/9puG2/e854984475.jpg Sakurako
http://puu.sh/9pusL/2dc6361541.jpg Rivarun
http://puu.sh/9putE/de2c93093f.jpg Mirakurun
http://puu.sh/9puul/abf589f549.jpg Ayano
http://puu.sh/9puuE/9119f88a7d.jpg Mari