[1] She was born on 30 August 1961 and is the daughter of Hawaiian jazz singer Jimmy Borges[2] and Japanese dancer Shizuko Yagi.
After a few auditions in 1991, she replaced singer Keiko Terada within the all-female Japanese heavy metal band Show-Ya under her full name, Steffanie Borges.
She remained in the band for six years, performing a highly media covered concert in North Korea in June 1991 and recording the single "Flame of the Angels" in 1992 and the album Touch the Sun in 1995 with the group.
She left the band in 1996 and moved to Los Angeles in the United States with her husband Randy Juergenson, who had worked with her during the recording sessions of Touch the Sun.
In the same year, Steffanie recorded her rendition of the song "Echo Valley-26809" for the Tin Idols tribute album to the Partridge Family Come On Get Heavy!.