Masumi Itō (伊藤真澄, born May 21) is a vocalist, composer, and musician from Ibaraki Prefecture, Japan. As a composer she is often credited as Hikaru Nanase (七瀬光) and occasionally Heart of Air. She began playing the piano when she was six years old. She debuted in 1993 with her album Harmonies of heaven. Her most notable early work was the soundtrack of Gemfire, the American version of Super Royal Blood, a popular Japanese title of the time.