On the same day as submitting the application for nursing school, she went to a book store and found an advert offering free anime voice acting auditions at Arts Vision. Several months after submitting a demo tape, she received a confirmation of passing the first stage of the audition, and eventually decided to continue training as a nurse while doing voice acting. After a year of voice actor training, Hayashibara was chosen to voice small roles on Maison Ikkoku. Initially, she had difficulty with her lines and had to redo many lines after the main recording sessions. Hayashibara later auditioned for Ranma ½ expecting to be cast as Akane Tendo, but was cast as the female half of Ranma Saotome instead. In 1993 and 1995, Hayashibara was a guest at Anime America. At the 1995 event, she decided to give a speech in English after believing the translation at the 1993 event did not reflect what she had said. In 1995, Hayashibara provided the voice of Rei Ayanami in Neon Genesis Evangelion, a role referred to as "innovative casting".
