2014 – present (4 years)
Koubai-bu (購買部, Purchasing Club) is a sub-unit of Sakura Gakuin.
The original members were Notsu Yunano and Shirai Saki. Notsu Yunano left the unit after her graduation from Sakura Gakuin in March 2015. Shirai Saki was the only member until Yoshida Soyoka joined the unit in August 2015. Shirai Saki left the unit after her graduation in March 2016. Aritomo Tsugumi temporarily joined the unit during Tokyo Idol Festival 2016, and was officially announced as a permanent member during Sakura Gakuin Festival 2016.
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