Kimama ni Idol
Type: OVA, Episodes: 1
Aired: Feb 25, 1990
Studio: Toei Animation
Source: Manga
Rating: R+ - Mild Nudity
Synopsis:
Three pretty girls want to make it big as pop stars, but it's tough on their way to the top. Based on a manga in Comic Burger by Kenichi Koya, it was distinguished by a marketing gimmick that had the three lead voice actresses taking to the stage for real in an early attempt at multimedia promotion.

(Source: The Anime Encyclopedia)