Yui Kusuhara is a voice actress from Fukuoka Prefecture, Japan, born on May 9. She is active in the anime industry, often working under the stage name Mai Ishihara for mainstream projects, while the name Yui Kusuhara is associated with her voice work in adult games and anime.

Kusuhara is affiliated with the talent agency GadgetLink. Her body of work includes a variety of anime series. She is credited with the role of Kyōko Ibara in the original video animation adaptation of Otome wa Boku ni Koishiteru: Trinkle Stars. In the Girls und Panzer franchise, she provided the voice for the character Orange Pekoe, a member of the St. Gloriana Girls College tankery team, and also voiced the character Suzuki. Additional notable roles include Natsume Mikage in Strike Witches, Sofina in Ange Vierge, and Mika Mikashima in Eternity Shinya no Nurekoi Channel.