The story takes place fifteen years after the events of the anime series and it revolves around Sora's younger sister, Yume. Because Sora has not visited her family in years for reasons unknown, Yume joins Kaleido Stage in hopes to meet her.

Various new characters have been introduced, old ones have also come back including Yuri Killian, May Wong, Marion Benigni, Mia Guillem, and Rosetta Passell.

(Source: Wikipedia)