After securing a scholarship at an elite high school, Kagami Yuuki faces a peculiar predicament when a teacher mistakenly registers him as a girl due to his name. Forced to reside in the girls' dormitory, Yuuki must navigate the challenges of concealing his true gender with the help of the responsible teacher, Kakinozaki Ayana, who becomes his roommate. To avoid expulsion, Yuuki must disguise himself as a girl outside his classes, maintaining the facade amidst the watchful eyes of his fellow dorm mates.