Hiromu Hayama, a girl who has been accepted into the university of her dreams, has decided to move into the dormitory. However, due to a procedural mistake made by her brother, she was forced to move into a boys' dormitory.

Hiromu lies about her gender and starts living in a boys' dormitory. As she lives with her unique dormmates, she gradually becomes more manly.

The story depicts Hiromu's hardships and her chaotic life with her free-spirited dormitory residents in a fun way.