Maison B

 is a Japanese dance and vocal boy group produced by KEN THE 390. All members were also contestants on the audition program Produce 101 Japan Season 2.

All members of Maison B exited Produce 101 Japan Season 2 while being apart of the "B rank" class of trainees. Accordingly, the "B" in the group's name represents a reversal from the "B class", and the group's determination to always "break" the status quo.

They debuted with the EP Foundations on February 15, 2023. They also have a J-Urban sub-unit called roomR (RICK and REIJI).

Their official fan name is "MBius".

Current Members
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 * RICK - Rap
 * LYU - Vocal
 * REIJI - Rap
 * MASATO - Vocal
 * TECO - Vocal
 * SHOYA - Vocal
 * HIKARU - Vocal

2022

 * May


 * KEN THE 390 announces he will debut a 5-member group on the television program "THE NEXT UP～次は君だよ" on Music Blood, aiming to debut people that failed the Produce Japan 101 Season 2 audition.


 * July


 * "THE NEXT UP～次は君だよ" airs on Music Blood, with RICK, REIJI, SHOYA, TECO and LYU being announced as members of the unnamed group episodically.
 * During the forming of Maison B on "THE NEXT UP～次は君だよ", SHOYA recommends HIKARU to be added to the group and REIJI recommends MASATO be added . Both pass auditions and are accepted into the group.


 * August

October
 * The group name "Maison B" is decided. The first teaser images for "Bringing Out" are released.
 * The group begins a crowdfunding campaign for 3,000,000 yen (Approx. ~21804USD) for the creation of their first pre-debut MV. Supporters of the project were given goods such as shirts, towels and wristbands and well as being credited in the MV for the song.
 * The music video for "Bringing Out" releases as well as being available for listening on streaming services. (Aug. 19, 2022)
 * Maison B perform their debut one-man stage at Shibuya WWW, dubbed "Maison B Kick off Party" (Aug. 20, 2022)


 * Their second pre-debut single, "Masquerade" is announced, and teaser images are released.


 * September


 * The fanclub name "MBius" is chosen by the members.


 * November


 * Maison B's subunit, roomR is announced and releases their first track, a feature on KEN THE 390's "Anything Goes". RICK and REIJI are credited as lyricists on the song, with the music video featuring them as well. (Nov. 01, 2022)
 * The MV for "Masquerade" is released as well as the song being made available on streaming services. (Nov. 18, 2022)
 * Maison B announce their debut EP, "Foundations" will release February 15, 2023.

December


 * roomR releases their first original song and MV as a part of the "O.B.S vol. 8" compilation album, entitled "Reverse".
 * Maison B begins their "Road to EX Theatre" free live tour, promoting before their debut stage at EX Theatre in Tokyo.

2023

 * January


 * The first teaser images and videos for "Foundations" a-side, "Paradise" are released. (Jan. 10, 2023)
 * "Paradise" is pre-released before "Foundations" on streaming services. The MV releases later that day. (Jan. 18, 2023)


 * February


 * Maison B's debut EP, "Foundations" is released, marking the group's debut. (Feb. 15, 2023). The album debuts 10th place on Oricon's daily album charts ranking.
 * "Foundations" ranks 2nd on Oricon's weekly indie album ranking.
 * Maison B begin a YouTube series entitled "Maison B Creative Camp", documenting the group creating their own original song including melody, lyrics, and choreography in the span of four days to be reviewed by their producer KEN THE 390. The series ends with their song "Time Capsule" being posted to YouTube, but not released to streaming platforms. (Feb. 18, 2023)
 * The regular radio program "Maison BのB級ラジオ" (Maison B's B-Class Radio) is announced on AuDee, and begins a weekly broadcast. (Feb. 27, 2023)
 * Maison B's "ROAD to EX Theatre" free live tour ends with a performance at Tower Records Shibuya. The performance is livestreamed for free on YouTube.

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EPs

 * 1) [2023.02.15] Foundations

Digital Singles
Unreleased Song(s)
 * 1) [2022.08.19] Bringing Out
 * 2) [2022.11.18] Masquerade
 * 3) [2023.01.18] Paradise


 * 1) [2023.02.18] Time Capsule

Trivia

 * Originally, KEN THE 390 planned for Maison B to debut as a 5-member group on "THE NEXT UP～次は君だよ" . The original lineup consisted of RICK, TECO, LYU, SHOYA and REIJI. HIKARU and MASATO were added to the group through the duration of the show after being recommended by SHOYA and REIJI respectively.
 * Their fan name, "MBius" comes from "Maison B" (MB) "Ai/愛/Love" (I) and "Us" (The fans and group together). Their fanclub logo is a Mobius strip, representing the group and fans supporting each other forever.
 * The official member colors were announced on December 31, 2022.