Mystery of the Girl Sushi Bar Band Solved!!
According to sources, the song in 窶廝lade窶 in which the Japanese shoolgirls are singing is called 窶廚hin Chin.窶
It was composed by Damien Wagner and performed by Bang Wa Cherry.
The song was written for the film and was sung by the girls you see in the movie.
The DJ in the movie is DJ June, who also did the DJ work for the track.
The song is not available on the soundtrack and it isn't clear, yet, whether any of
the artists responsible for that song have released any of their work.
So keep on eye out for any future releases by Bang Wa Cherry, DJ June, and Damien Wagner!