SI☆NA Formed August 26, 2006 Disbanded April 17, 2011 Members 4 all-time Former Members 4 Iwashima Manami 岩嶋雅奈未 August 26, 2006–April 17, 2011 (1,695 days) Leader from August 26, 2006–April 17, 2011 (1,695 days) Abe Asami 阿部麻美 August 26, 2006–April 17, 2011 (1,695 days) Nakayama Nana 中山菜々 August 26, 2006–July 25, 2009 (1,064 days) Suma Ai 須磨愛 August 26, 2006–April 17, 2011 (1,695 days)
