Flow (stylized in all caps) is a Japanese rock band formed in 1998 as a five-piece band made up of two vocalists, a guitarist, a bassist, and a drummer. They are signed to Sacra Music. As of February 2023, the band has released 39 singles and 12 studio albums. Their songs have been featured in the opening sequences of several anime and Japanese drama series.

Source: Wikipedia (https://en.wikipedia.org/wiki/Flow_(Japanese_band))