Dangeki!

I'm a girl, and I'm in the boys' theater club (dangeki)!

Akira Segawa, a handsome girl aiming to become an actress, fails her high school entrance exam. Just when she's worried about her future, she gets a helping hand! She is scouted by the "boys" drama club of Shirou High School, a regular participant in national competitions! As a condition of admission and joining the club, Akira has to enter as a "man"...! The members of the drama club are all boys with strong personalities, and the risk of being exposed is always at its maximum...! If he's found out, he'll be expelled immediately!

(Source: Hakusensha, translated)