Her career began after high school when, because she did not want to practice cooking and cleaning ready for bridal training, a friend invited her to audition for a Radio drama, which she passed and debuted.
[1] Sasuga then experienced opposition from her parents and actual marriage, and considered retiring from her career several times, but continued to work, as she had never lost any regular appearances since her debut.
[1] Sasuga specialized in playing the roles of infants and young girls, taking advantage of her cutie voice.
Sasuga was cast as Sazae-san's character, Tarao Fuguta, Sazae's son in the longest running Anime in 1969.
[1] In 2019, she was recognized by Guinness World Records alongside co-stars Midori Katō (Sazae) as the "Longest career as a voice actor for the same character of an animated TV series".