The story revolves around Yuuki Kagami, a boy who enrolls in the academy of his dreams as a honors student &mdash; and is mistakenly put in the girls' dormitory where boys are prohibited. Faced with the possibility of having to leave the school, Yuuki has to dress up as a girl in the dormitory. On top of things, he ends up rooming with the female teacher Ayana Kakinozaka, who has to watch over him.

Kagami Yuuki has managed to become a scholarship student in a high-class high school. Unfortunately, thanks to his gender-ambiguous name, the teacher Kakinozaki Ayana has registered him as a girl! It's apparently an uncorrectable mistake, so now Yuuki must live in the girl's dormitory of his new (co-ed) high school. <br><br>
At least Ayana's willing to take responsibility for her mistake; she volunteers to be his roommate. As one would guess, he and Ayana must make sure none of the other girls in the dorm find out he's actually a boy. Therefore, except for when he's in his classes, Yuuki has to cross-dress, or else both he and his teacher will be kicked out of the school and dorm!<br><br>
(Source: MangaHelpers)

Inchou