Ballet Hero Fantasy - Dan no Bouken feat. Steven McRae

From Manga Mavericks Books:

A pirouette is power.

Dan’s dream is to be a dancer. He has plenty of heart, but his ability doesn’t quite live up to his passion. Despite this, he looks up to his upperclassman Steven McRae, who is worlds beyond him…literally. Using a magic mirror, Steven travels to a fantastical world, where he acts as a Ballet Hero! When Dan accidentally ends up following him, Steven quickly realizes that Dan being here is no coincidence.

This action-adventure manga combines ballet, tokusatsu, and the amazing art of veteran artist Takafumi Adachi! Dance to the stars with Ballet Hero Fantasy!