Maison book girl
Years Active




Associated Acts




Koshouji Megumi
Yagawa Aoi
Inoue Yui
Wada Rin

Former Members

Soumoto Kaori


Promoting Umi to Uchu no Kodomotachi


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.

Members Edit

Past Members Edit

History Edit

2014 Edit

On July 8th, at BiS' disbandment live, Koshouji Megumi announced that she would be forming a new unit, named 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.

2015 Edit

Maison book girl's debut singles, white and black were sold exclusively at their shows from March 14th.

On March 27th, Soumoto Kaori graduated from Maison book girl and Wada Rin joined the same day.

Maison book girl's debut album Bath room was released on September 23rd.

2016 Edit

At the beginning of 2016, Maison book girl signed with Tokuma Japan Communications.

On April 30th, they released their major debut EP, summer continue.

In October, Maison book girl toured Canada as part of the Next Music From Tokyo event.

On November 30th, they released their major debut single, river (cloudy irony).

2017 Edit

Maison book girl's second major single, 412, was released on July 19th.

On December 13th, Maison book girl released their third major single, cotoeri. The lyrics for the title track were generated by an AI.

2018 Edit

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.

Maison book girl's third album, yume, was released on November 21st.

2019 Edit

On April 3rd, 2019, Maison book girl released their 7th single, SOUP.

On July 31st, Maison book girl released another single, Umbla.

From November 27th to December 18th, Maison book girl appeared in their own web series on Amazon Prime, Pick Ups! -Maison book girl-.

Maison book girl released their fourth album, Umi to Uchu no Kodomotachi, on December 18th.

2020 Edit

In early January, Maison book girl announced the release of their best-of album, Fiction. It's release was initially scheduled for April 29th, but was then postponed to June 24th due to the coronavirus pandemic.

Discography Edit

Other Media Edit

Web Series Edit

Trivia Edit

  • The B-Sides to most of their singles are readings of poetry written by Koshouji Megumi.
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