Founded in 2012,[1] the band has released several self-produced albums and singles, including the One Piece anime theme song "Paint".

[2] The band focuses on creating high energy dance music with memorable choruses and a light feeling that can take away the burdens of everyday life, including the "Mondays" referenced in their name.

[3] In addition to several tours of Japan, the band has performed internationally at festivals in Jakarta, Sao Paulo, Taipei, and Barcelona.

[citation needed] "Super Special" was chosen as the ending theme for the Japanese broadcast of the American crime drama series Rizzoli & Isles.

[19] They launched their first national tour in October[20] and performed a solo concert at Zepp DiverCity in Tokyo on November 19.

The limited edition release also contained 11 live videos from the 2016 Japan tour and the final performance at Zepp DiverCity.

The album contained new mixes of "Tonight" and "Fire" created for the release, and the special edition Blu-ray featured a documentary of the band's recent tours and their decision to change labels.

[22] Leading up to the album's release, the band performed the new song "Diamond" for the first time at the Join Alive festival in Hokkaido on July 13.

[2] Yu stated an affinity for the series, claiming it was the only manga he has kept reading childhood, and used the teamwork aspect of his own band as inspiration.

[27] To prepare for the song's creation, Yu corresponded with One Piece creator Eiichiro Oda to express his thoughts about the series' theme of overcoming adversity.

[29] In February 2023, their songs "Moon Night" and "Wolf Vibes" were used as the opening and ending themes for the TV drama Zenryoku de, Aishite Ii Kana?

[26] The band has noted that the sound of their early recordings was based on international influences, incorporating soul, disco, and pop.

The members have cited a range of influences including Katy Perry, Bruno Mars, Kanye West, The Beatles, Oasis, and Peter Gabriel.

[33] Beginning with 2021's Black Humor, the band made a conscious decision to focus more on the Japan's domestic J-Pop audience.

[27] The band collaborates equally on song creation, using digital technology to share ideas and build each track remotely when they are not in the studio together.

music video[39] and presented a performance event in September with AllSaints as part of Vogue Fashion's Night Out.