Yū Hayashi is a Japanese voice actor and singer from Kanagawa Prefecture attached to Ken Production. Formerly a child actor attached to Gekidan Himawari, he mainly specializes in dubbing roles. He is vocalist of Screen Mode, a band signed with Lantis.

Ultra Maniac is a Japanese manga series written by Wataru Yoshizumi. The romantic comedy series features 8th grader Ayu Tateishi, a tennis club member, and her transfer student friend, Nina Sakura, who is actually a trainee witch from the magical kingdom. It premiered in Shueisha's Ribon manga magazine in February 2001 and ran until January 2004. It was also published in five collected volumes by Shueisha. Viz Media licensed and released an English translation of the series in North America. With Miho Shimogasa by designing the characters and Animation Production by Ashi Productions.