Nanase Hina is a girl with an androphobia. She's very happy that she's finally able to enroll in Seika Girls Academy and even became roommates with Yukino Kaede, whom she thinks is the ideal girl; beautiful, refined, and perfect. Except... Kaede is actually not a girl.
Except for the first chapter, the story is mostly from Kaede's point of view. The author herself said Kaede is the real protagonist.