Maison book girl
Years Active




Associated Acts




Koshouji Megumi
Yagawa Aoi
Inoue Yui
Wada Rin

Former Members

Soumoto Kaori


Promoting SOUP


Promoting yume


Promoting elude


Promoting cotoeri


Promoting 412


Promoting summer continue

Maison book girl are a Japanese idol group signed under ekoms and founded by former BiS member Koshouji Megumi.


Past Members


On July 8th 2014, at BiS' disbandment live, Koshouji Megumi announced that she would be forming a new unit, Book House Girl, with former Izukoneko producer Sakurai Kenta. On November 5th, the group's name was changed to Maison book girl and Koshouji Megumi, Soumoto Kaori, Yagawa Aoi and Inoue Yui were revealed as the group's official lineup.

Maison book girl began performing live at the start of 2015, with the singles white and black being sold exclusively at their shows. On March 27th, Soumoto Kaori graduated from the group and Wada Rin joined the same day. In September their debut album Bath room was released.

In 2016, Maison book girl signed with Tokuma Japan Communications. They released their major debut, Summer continue, in March. In October 2016, Maison book girl toured Canada as part of the Next Music From Tokyo event. Their first nationally-distributed single River (cloudy irony) was released in November.

In early 2018 Maison book girl signed with the UK label Read The Air Records. Their first international release, Karma // bath room (UK Version) was released on vinyl on May 18th. To promote the single, Maison book girl held their first UK tour, performing at 4 different locations. Their third album, yume, was released on November 21st.

On April 3rd, 2019, Maison book girl released their 7th single, SOUP. Not long after its release, they announced Umbla to be released in July.

Maison book girl released their fourth album, Umi to Uchu no Kodomotachi, in December 2019. To promote the album, a web series, Pick Ups! -Maison book girl- was released on Amazon Prime Video.

In early January, Maison book girl announced the release of their best-of album, Fiction.


Other Media

Web Series


  • The B-Sides to most of their singles are readings of poetry written by Koshouji Megumi.
Community content is available under CC-BY-SA unless otherwise noted.