Mizuki Ashiya is a fictional character from the popular Japanese 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-boys school, Ohsaka High School, in order to get closer to her idol, Sano Izumi, a talented high jumper. Throughout the series, Mizuki faces various challenges while maintaining her disguise, showcasing her resilience and adaptability. Her character embodies themes of friendship, love, and the struggles of identity, making her a relatable figure for many fans of the series.