When production of You Only Live Twice began, Wakabayashi was originally slated to play the role of Kissy Suzuki whilst her co-star Mie Hama played Suki, one of Tiger Tanaka's top agents. When learning English proved to be a major hurdle to Hama, the women switched roles, with Hama now playing the smaller part of Kissy and Wakabayashi playing the larger part of Suki. At her suggestion, the character of Suki was renamed Aki.
Wakabayashi made only one more film (and a guest TV appearance) before disappearing from both the big and small screen. In an interview in G-FAN magazine (No. 76), Wakabayashi said she retired from acting owing to injuries sustained while making a movie.