Mizuki disguises herself as a boy and transfers to the same all-boys' high school her idol, Izumi Sano, a high-jump athlete who gave up on the sport, attends. In between their classmates' antics she tries to get him to jump again.

Set at the all-boys school Rokuto Academy, the story revolves around Hasukawa Kazuya a late arrival to the unusual Greenwood Dormitory, a former insane asylum.