Yasunao Sakai is a Japanese voice actor born on January 17, 1996, in Tokyo, Japan. He is affiliated with the talent management firm Aoni Production. Sakai is a graduate of the Entertainment Media Comprehensive Academy.

Sakai's career in the anime industry began in 2016, with his early roles consisting mainly of background characters and townspeople in long-running and popular series. His debut year included minor roles in Digimon Universe: Appli Monsters, Dragon Ball Super, and One Piece. He continued to build his portfolio with uncredited appearances in numerous television anime throughout the late 2010s. Notable series in which he provided voice work for minor characters during this period include Yowamushi Pedal, Re:CREATORS, Rascal Does Not Dream of Bunny Girl Senpai, Fruits Basket (2019), and Fate/Grand Order - Absolute Demonic Front: Babylonia.

His first major, named role came in 2022 when he was cast as Taiga Amakado in the multimedia franchise Futsal Boys!!!!!. This project, which included both an anime television series and a mobile game, featured Sakai as a member of the main cast for the Koyo Futsal Club. He also had a supporting role as Corporate Slave C in the 2022 short-form anime Miss Shachiku and the Little Baby Ghost. More recently, his voice can be heard in the 2024 series Dragon Ball Daima, where he voices multiple minor characters, including members of the Kadan Army and a gatekeeper.

In addition to his work in anime, Sakai has also performed voice roles in video games, such as the 2017 game Goddess Connection, and in live-action tokusatsu series like Uchu Sentai Kyuranger. His personal interests include muscle training, track and field, and collecting stones, and he holds a license for riding a motorcycle. He also possesses the skill of speaking Chinese.