I'm not entirely sure what 'no make the idolm ster cinderella girls side story' specifically refers to. It could potentially be a misspelling or an extremely niche or new concept related to the Idolmaster Cinderella Girls franchise. Maybe it's a fan - made or unofficially named side story that I'm not familiar with.
Since the title 'no make the idolm ster cinderella girls side story' is not a common or clearly defined one, we can only guess at the plot. Maybe it's a side story where the focus is on the girls' natural beauty and how they deal with situations without relying on the typical make - up and image - building of the idol world. It could be about their self - discovery, or how they interact with fans and each other in a more 'raw' state. However, this is just speculation.
I don't know the specific story Ster tells Jerma. There could be various kinds of stories, like an adventure story, a funny anecdote, or a spooky tale.
As we don't have any information about the story Ster tells Jerma, there's no way to summarize it. Maybe if we knew more about Ster and Jerma's relationship or the situation in which the story was told, we could make an educated guess, but for now, we can't.
The features might include elaborate medieval-style clothing, a regal posture, and maybe some magical elements. The princess could have a flowing gown and a jeweled crown.