Glass no Kamen, Ashita no Ousama Recommendations
They both talk about plays and acting. :) Ashita no Ousama, on the other hand, talks about the script writer and how their script makes it to the screen, so to speak. :)
Both mangas involves girls that are interested in the theatre, one scriptwrting/directing and the other acting. Both have amazing talent, and one ultimate goal. One wants to write a perfect one-actor script and the other to act in The Crimson Goddess.
Just like Glass no Kamen the lead protagonist is passionate about theater, puts her heart out in the work she does and is determined to do her role perfectly. Moreover both of them work to become better at in their career and fame follows them with time. Both of them are successful in leaving all the people around them spellbound and moved by with their actions and words.