 Aki Toyosaki ( <unk> <unk> , Toyosaki Aki , born October 28 , 1986 ) is a Japanese actress , voice actress and singer from Tokushima Prefecture , Japan . She had her first major voice acting roles in 2007 , voicing Amuro Ninagawa in Kenkō Zenrakei Suieibu Umishō and Su in Shugo Chara ! . She was named " Best New Actress " at the 4th Seiyu Awards in 2010 for her role as Yui Hirasawa in K @-@ On ! and Kana Nakamachi in Kanamemo , and received the " Best Lead Actress " and " Best Personality " awards at the 5th Seiyu Awards in 2011 . 
