Hirai Yuki (平井 雄基) (born August 22, 1992), affiliated with Oscar Promotion Co.ltd., is a stage play actor who portrays Fuduki Kai in the TSUKIUTA STAGE (From Act 9) series. Prior to being cast as the actor for Kai, Hirai previously appeared in the SolidS & QUELL on STAGE series' third episode, ROMEO - in the darkness -, as the actor for Romeo.