18

 (read as Ichi-hachi) was a second-hand clothing themed idol group active from February 2012 to June 2015.

Final Line-up

 * Kamei Naoki (亀井直生) (Founding member)
 * Ito Satsuki (伊東さつき) (Joined November 2012)
 * Teshigahara Rina (勅使河原莉奈) (Joined November 2012)

Former Members

 * Nihei Yuki (仁平有紀) (Joined November 2012, left January 2013)
 * Tsuji Akubi (辻あくび) (Joined November 2012, left July 2013)
 * Tanaka Misato (田仲美里) (Joined November 2012, graduated October 2013)
 * Ueda Pyonkichi (植田ぴょん吉) (Founding member, graduated December 2013)
 * Shizuki Karen (紫月華練) (Founding member, graduated December 2013)
 * Muranaka Yuka (村中友香) (Founding member, graduated December 2013)
 * Miura Hiroko (三浦裕子) (Joined November 2012, left April 2014)
 * Yayoi Akari (弥生朱莉) (Joined November 2012, left July 2014)
 * Noro Ayana (野呂絢奈) (Joined November 2012, contract cancelled December 2014)
 * Watanabe Orie (渡辺織衣) (Joined November 2012, contract cancelled December 2014)
 * Anchi (あんち) (Founding member, graduated December 2014)
 * Ashli Chiho (アシュリー千帆) (Joined January 2013, graduated December 2014)
 * Sakura Maki (桜まき) (Founding member, graduated December 2014)
 * Suzuki Mai (鈴木まい) (Joined May 2012, graduated December 2014)
 * Naruse Mako (なるせまこ) (Joined January 2014, graduated December 2014)
 * Hoshi Mahiro (星まひろ) (Joined November 2012, graduated December 2014)
 * Yoshioka Konomi (吉岡このみ) (Joined November 2012, graduated December 2014)
 * Kitami Kaori (北見かおり) (Joined December 2013, left March 2015)

Albums

 * [2013.12.25] 18 Tamashii!! (18魂!!!)

Mini Albums

 * [2012.04.06] 18 Daisakusen! (18大作戦!)

Singles

 * [2012.08.03] ☆Natsu☆Dai Bakuhatsu! (☆夏☆大爆発!)
 * [2013.07.31] Kirakira☆summer (キラキラ☆summer)
 * [2014.03.11] Tabidachi no Toki (旅立ちの時)
 * [2014.07.29] Wasshoi Matsuri (ワッショイ祭)