Fierce Mayuyu on Mechaike めちゃ2イケてるッ!SP - poor Yuko Happier days from the past
Yuko mentioned Mayuyu on her interview from Sousenkyo Official Guidebook (thanks to ひかぴ @twitter):Transcript: 『麻友には一度でいいから総選挙で一位を獲らせてあげたい。あの景色を見せてあげたいなって思います。ファンの方が押し上げてくれたセンターで、これこそ渡辺麻友という彼女の代表曲を持たせてあげたい。』Basically Yuko said "I want Mayu to take 1st place even only once. I really want her to see that scenery (of being 1st). By being a center that's pushed up by fans, I want her to have a song that represent 'this is Watanabe Mayu'."
do you have any link for the video?
Watanabe Mayu’s G+:優子ちゃん、約8年半本当にお疲れ様でした!Yuko-chan, you’ve done well for about 8 years and a half!優子ちゃんにはデビュー当初からとてもお世話になりました。I’ve been in Yuko-chan’s care a lot ever since I first debuted.優子ちゃんの背中を見ながらいつも近くで活動させていただき、沢山のことを学ばせていただきました。I’ve always got to work near Yuko-chan while watching her back, and I’ve learned lots of things from her.優子ちゃんの後輩になることができて幸せです。I’m glad that I got to become Yuko-chan’s kouhai.これからの優子ちゃんに素敵な未来が訪れますように…I hope Yuko-chan would have a wonderful future coming to her from now on…最後の、おしりシスターズ!The last, Oshiri Sisters!