Kageki Shojo Vol 1

Kageki Shojo!! by Kumiko Saiki. A Shojo manga rated Teen, published in English by Seven Seas.

Tall, blunt and endlessly determined, Sarasa Watanabe enrolls at the Kouka School of Musical and Theatrical Arts, the training ground for a famous all-female theater troupe, dreaming of playing the role of a lifetime. Her roommate Ai, a former idol who wants nothing to do with anyone, is about to find that hard to ignore.