Mizuki Ashiya, a high school girl living in America, is intent on helping her high jump idol bounce back from a career-ending injury after he abruptly quits the sport. But when she transfers to Japan, it is an all-boys boarding school, and she must disguise herself as a boy just to enroll. Using her determination and secrets from her double life, Mizuki recruits the help of a few loyal friends to survive the dorms, win sports tournaments, and hide her true gender from it all. But will she be able to win his heart and stop her secret from being exposed?