Maison book girl, originally known as Book House Girl and sometimes abbreviated as BookGa (ブクガ), is a japanese alt-idol group formed in July 2014 and produced by Sakurai Kenta (サクライケンタ). It currently consists of 4 members : Koshoji Megumi (コショージメグミ ; former BiS member), Yagawa Aoi (矢川葵 ; Miss iD 2015 finalist), Inoue Yui (井上唯) and Wada Rin (和田輪). In addition to their musical activities, the girls promote fashion, art and street culture.