Mizuki Ashiya is the main character in the manga series Hana-Kimi, created by Hisaya Nakajo. She is a determined 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 journey explores themes of friendship, identity, and the struggles of adolescence, as she navigates life in a male-dominated environment while trying to keep her true identity a secret.