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Watanabe made her professional debut as a manga artist in 1979 with the short story Waka-chan no Netsuai Jidai. In 1987, she won the Excellence Award at the 16th Japan Cartoonists Association Awards for her comedy series Saint 14 Graffiti. She has twice received the Shogakukan Manga Award in the shoujo category: in 1991 for Hajime-chan ga Ichiban! and in 2003 for Kaze Hikaru.