[1] They formed Flow in 1998, and by 2000, were joined by Keigo (vocals), Gotō (bass) and Iwasaki (drums).

[12] Flow then released "Colors" in 2006, the first opening for Sunrise's original series, Code Geass: Lelouch of the Rebellion.

[13][14] Their song "Answer" was the first opening theme for the live action Japanese drama Detective School Q.

[16] In February 2008, they released a new single titled "Arigatō", followed by Persona -trinity soul-'s new opening, "Word of the Voice" in June 2008.

They performed Code Geass: Lelouch of the Rebellion R2's second opening theme "World End" released in 2008.

[18] Flow returned to North America to perform at Anime Central, in Rosemont, Illinois on May 20, 2011, and FanimeCon in San Jose, California on May 28, 2010 and in May 2011.

[24] Flow returned to Brazil in the summer of 2014 to perform at Anime Friends in Sao Paulo and at SuperCon in Recife.

[25] Their single, "7 -seven-", was a collaboration with the band Granrodeo and was featured as the ending theme to the anime The Seven Deadly Sins.

Their single "Innosense" was released on February 8, 2017; the song was used as the second ending theme of Tales of Zestiria the X.

[35] They held a special online concert series featuring all 11 of their albums titled Flow Special Online Live Comprehensive Album Series: Flame of 12 Months every 26 of the month, which started on September 26, 2020 and ended on August 26, 2021.

"Puddle of Rainbow Color") for the virtual YouTuber agency Nijisanji, which celebrated their 3rd anniversary in 2021.

The song was sung by a total of 12 livers, including Akina Saegusa, Furen E Lustario, Hayato Kagami, Kaede Higuchi, Kuzuha, Rena Yorumi, Rion Takamiya, Ryushen, Saku Sasaki, Sara Hoshikawa, Shellin Burgundy, and Toya Kenmochi.

[37] On August 9, 2021, they held their first in-person concert since the COVID-19 pandemic titled Flow The Carnival 2021 ~Shinsekai~ in Line Cube Shibuya.

"Dice" was used for the first opening theme song of the 15th anniversary rebroadcast of the 2006 anime series Code Geass: Lelouch of the Rebellion.

"Moment" (モメント) was featured in the slot machine game Pachislot Anemone: Eureka Seven HI-Evolution.

The new single titled "Daydream Believer" (デイドリーム ビリーヴァー)" was a collaboration with the band Orange Range and was used for the second opening theme of 15th Anniversary re-run of Code Geass: Lelouch of the Rebellion R2 anime.