9nine (pronounced as "nine") is a 4 member idol unit signed under LesPros Entertainment. The group original line-up consisted of nine members chosen through an audition. Since switching record labels in 2010, the group has focused on becoming more of a "performance girls unit."

Current members:

- Uki Satake (佐武宇綺)

- Sayaka Nishiwaki (西脇彩華)

- Kanae Yoshii (吉井香奈恵) - joined in 2010

- Hirona Murata (村田寛奈) - joined in 2010

Ex-members:

- Azusa Matsuzawa (松沢 梓) - left in January 2007

- Miwako Wakatsuma (我妻 三輪子) - left in January 2007

- Rubi Katou (加藤 瑠美) - left in December 2007

- Marie Ashita (芦田 万莉恵) - left on March 27, 2009 (ex-leader)

- Mai Yoshida (吉田 茉以) - left on March 27, 2009

- Midori Yamaoka (山岡 みどり) - left on March 27, 2009

- Madoka Shimogaki (下垣 真香) - joined in 2007, left on August 31, 2010

- Moe Miura (三浦 萌) - left on August 31, 2010

- Umika Kawashima (川島 海荷) - joined in 2007, left on July 23, 2016