Koubaibu

 is a former Sakura Gakuin sub-unit originally formed with two members in 2014.

They made their stage debut on September 27, 2014, during the Yoru Kouen Fast Pass Soudatsu-sen Sakura Gakuin 2014 Nendo Aki Gakki Shiken show @Differ Ariake.

Former Members

 * Notsu Yunano (野津友那乃; Pink ) (Founding member; graduated March 29, 2015)
 * Shirai Saki (白井沙樹; White ) (Founding member; graduated March 27, 2016)
 * Yoshida Soyoka (吉田爽葉香; Pink ) (Joined 2016; graduated August 30, 2020)
 * Aritomo Tsugumi (有友緒心; White ) (Joined 2016; graduated August 30, 2020)

Original Songs

 * 1) Piece de Check! (ピース de Check !)
 * 2) Piece de Check! -2015-
 * 3) Piece de Check! -2016-
 * 4) Akindo ☆ Soul (あきんど☆魂; Shopkeeper ☆ Soul)