Based on a popular comic, this hilarious comedy follows the chaos, troubles and friendship at a boys' boarding school after a girl-disguising-a-boy joins. Ashiya Mizuki has just come back to Japan from California where she was raised. She fell in love with Sano Izumi, a hopeful high jump hero, who has quit after an accident. As she wants him to go back to the sport once again, she enters the same high school as a boy! With a short hair, flattened chest and lowered voice, she starts sharing the same room with Sano.