Mizuki Ashiya has such a crush on a track star named Izumi Sano that she moves from the U.S. to Japan to enroll in the all-male high school he goes to! Pretending to be a boy, Mizuki becomes Sano's roommate...but how can she keep such a big secret when she's so close to the guy she wants?

Sano's younger brother Shin hasn't forgiven him for leaving home five years ago. Now that Sano and Shin are competing against each other in a high-jump event at Gakuin High, Sano is faltering under the emotional pressure. To make matters worse, Sano's estranged father shows up. Can Mizuki help Sano get his head back in the game?