Flow 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.

Code Geass: Lelouch of the Rebellion , often referred to simply as Code Geass, is a Japanese anime television series produced by Sunrise. It was directed by Gorō Taniguchi and written by Ichirō Ōkouchi, with original character designs by Clamp. Set in an alternate timeline, it follows the exiled prince Lelouch Lamperouge, who obtains the "power of absolute obedience" from a mysterious woman named C.C. Using this supernatural power, known as Geass, he leads a rebellion against the rule of the Holy Britannian Empire, commanding a series of mecha battles.