Junna was born on March 15, 1971, in Minoh, Osaka, and grew up in the nearby Toyonaka.
Due to her singing ability, she was chosen to be the etoile (the singer in the last scene).
In 1994, following encouragement from the troupe, she auditioned and was chosen to star in NHK's 51st asadora Piano.
She made her top musumeyaku debut that same year, starring alongside Miki Maya in East of Eden/Dandyism!
In 2001, she starred alongside Anita Mui and Simon Yam in the 2001 Hong Kong film Midnight Fly.