The group consists of four members, Emi, Hinata, Cocomi, and Michelle, and captivates audiences with their rich vocal range and overwhelming singing ability.

His debut song "Butterfly" was written by YOSHIKI for the Hollywood movie "BRIDE HARD" (to be released in the US on June 20th), and Bi-ray was chosen as the singing artist.
The film stars world-famous actress Rebel Wilson, known for her role in the Pitch Perfect series, and is directed by Simon West, known for his work on Con Air and The Expendables 2. The film is a hot topic as it brings together a star-studded cast.

"Butterfly" is a song that demands emotive and highly advanced vocals that combine delicacy and strength, and it fully demonstrates Bi-ray's dynamic expressiveness.

This song is not just a debut song, but a work that can be said to be the "origin" of Bi-ray.

It is a bold and powerful anthem that captures the moment when young women take flight and transform into shining stars, serving as the prologue to their soaring into the future.