User blog comment:Pinga Bird/Let's Graduate with Niigaki Risa/@comment-33866691-20121128195412

Niigaki Risa has already graduated, All the 5ki members are gone.

Soon, Sayumi will be the only 6ki member (Reina Tanaka has recently announced her graduation..) After the 6ki, All MM will have left is the 9ki, 10ki, 11ki (and possibly 12ki~13ki)