Tomoko Ai's journey into the world of acting was an unforeseen development, as she never initially harbored aspirations to become a performer. However, once she embarked on this path, she soon gained international recognition for her captivating portrayal of Katsura Mafune in the iconic 1975 film, Terror of Mechagodzilla, which marked the final installment in the Showa series of Godzilla movies.
Before her breakout role in the Godzilla franchise, Tomoko Ai had already made a name for herself by playing the character of Haruko Matsuki, a member of the Monster Attacking Crew (MAC),in the popular Japanese television series Ultraman Leo, which aired from 1974 to 1975.