Hashirajima Gakuen is a historic girls’ school which turned co-ed due to the declining birthrate. However, the school remained overwhelmingly female. Kei is a boy who transferred into the school and started living at the Saiunryou dormitory for out-of-towners and students with special circumstances. The girls at the dormitory had been preparing for a cute new kouhai to join them and were shocked to find out that the new resident was a boy.

[From Hau~ Omochikaeri!]