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?

Nakao confesses his love to upperclassman Nanba by giving him chocolates for Valentine's Day, and he convinces Mizuki to do the same with Sano. But as roommates and friends, a rejection could make Mizuki's situation unbearable. And is she truly ready to confess her love to Sano...as a boy?!