This is one of many, many ways to summarize the events of Revolutionary Girl Utena: from Anthy's perspective.
The name "Utena" means "calyx": the part of a plant that protects a flower before it blooms. On the face of it, it looks like Utena is the heroine of the series; but if you look at it another way, she's just the vehicle to help Anthy bloom.
(Which might explain why, in the movie, Utena turns into a car. Or the screenwriters might just have been on crack. Take your pick.)