Career
Watanabe came under exclusive contract with and made her studio debut as the lead role in an Atsushi Fujiura entry in the ama sex comedy series, Marked Ama: Stirred-Up Shell (くいこみ海女 乱れ貝, Kuikomi ama: midaregai) released on 9 July 1982. Watanabe had a prolific career, playing both lead and supporting roles in a wide range of Roman Porno films. With her athletic build, she was also a popular glamour model and had appearances in "image videos" as well as photo-books
にっかつロマンポルノ女優六人集「ひ・め・ご・と, Tatsumi Publishing, 10 April 1984, featuring actresses Ryoko Watanabe, Natsuko Yamamoto, Kaoru Oda, Kate Asabuki, Mina Asami, Kaori Okamoto.