Career
From 1983 to 1996, she portrayed the nurse Shiho in Series 7–14 of the long-running prime-time series Ōoka Echizen on the nationwide Tokyo Broadcasting System network. A frequent guest star in jidaigeki roles, she has seven appearances in Mito Kōmon to her cartulary-register Contemporary roles include parts in a 2004 television series spinoff of Castle of Sand and the 1985 Star Tanjō.
Ritsuko also acts in two-hour mystery dramas, with roles in the Monday, Wednesday and Saturday prime-time slots.
Ritsuko has appeared in two films. Her product endorsements include advertisements for Calpis, House Foods, and Lake (Shinsei Financial Company, Limited).