She was affiliated with Kirin Pro and started her career in 2001. In 2007, she moved to LesPros Entertainment. In 2008, she changed her name to "Riria". In 2011, she won the Playboy Grand Prix prize at the third Gravure Japan awards. In 2014, she appeared in two tokusatsu series; Ressha Sentai ToQger and Zero: Black Blood. In June 17, 2015, she changed her name to "Riria Kojima".