One of the main characters of the Idolmaster series.
A smart, cool 18-year-old who was originally an intern for 765 Production, but later promoted to idol due to lack of idols scouted. Industrious and focused, Ritsuko also handles the business side of her career, and retains her conservative style even as an idol, rarely taking off her glasses and letting loose her hair, which is often tied into twin braids. Her cousin Ryou appears in the DS game Dearly Stars as an idol of 876 Production.
She is voiced by Wakabayashi Naomi [若林 直美].