Two pop idol Ai fans are reincarnated as her "secret" baby twins, Aqua and Ruby, and grow up supporting her until the tragic day she is stabbed by a stalker. Flash forward a few years later and Aqua and Ruby are high school students determined to make it on their own in the cutthroat world of entertainment for personal reasons.

The ending of this drama is told in "Oshi no Ko: The Final Act" (2024) theatrical movie.