Mizuki Ashiya is a fictional character from the manga and anime series Hana-Kimi, created by Hisaya Nakajo. She is a determined and spirited girl who disguises herself as a boy to attend an all-male high school in Japan, hoping to get closer to her idol, Sano Izumi, a high jumper. Throughout the series, Mizuki faces various challenges while maintaining her disguise. Her character embodies themes of friendship, perseverance, and the complexities of gender identity, as she navigates her relationships with other students and her growing feelings for Sano.