Hayato began his career as an attorney in 1998 at Yamasaki and Partners, while belonging to the First Tokyo Bar Association. In 2000, he joined the Kasahara Law Office, becoming a partner in 2002. Utilizing his language skills and vast experience overseas, he took on numerous clients not just from Japan, but from all over the globe. With his reputation as a well-known and trusted attorney in Japan, Hayato established the Terai Hayato Law Office in 2005 and has since satisfied even more clients internationally. Hayato has been the Chief Legal Officer at Ganapati PLC, GPJ Venture Capital and Ganapati Malta Ltd, since 2017. As of 2018, he is also the Co-CEO of G8C.