The vocalist of ‘Melody Rhythm’, a popular music duo. Hibiki always performs alongside her twin sister, Kanade. She cares about her sister but often treats her harshly due to her “older sister” complex. Furthermore, she may also harbor some feelings of jealousy and inferiority towards her twin. When Kanade's psychotic thoughts show, Hibiki often is put into her "puppet state" by her twin, making her unable to fight back no matter what. and having no memories of the goings on.