I know this is pretty old, but
http://www.youtube.com/watch?v=qmM33gdRhlY
(from darthjinstu at youtube) They were supposed to practice their dance at home, Risako didn't practice due to her show. So she got in trouble and was forced to practice alone, the rest of the Berryz were sad because she always gets singled out like that. Last time she was singled out she had to hold two pals of water up for the remainder of the class period.
This kinda made me sad. I normally dislike Risako but I feel really bad for her here, she always was singled out. She was like nine years old at the time of this. Also some of the other kids were crying, I almost wanted to cry with them T_T