Japanese-American track-and-field star Mizuki has gotten herself a transfer to a high school in Japan...but not just any school! To be close to her idol, high jumper Izumi Sano, she's going to an all-boys' high school...and disguising herself as a boy! But as fate would have it, they're more than classmates...they're roommates! Now, Mizuki must keep her secret in the classroom, the locker room, and her own bedroom. And her classmates - and the school nurse - must cope with a new transfer student who may make them question their own orientation...