Mizuki Ashiya  

, 芦屋 瑞希

Mizuki Ashiya is the main character in the story. She moved from Japan to America at a young age and later decided to attend Osaka Gakuen High School in Japan because her favorite athlete, Sano Izumi, also attends there. To blend in with the boys, she cuts her hair short, wears a ruffled vest, and keeps her boobs hidden. Although Mizuki has a flat chest, which is beneficial for running, she wishes to have more cleavage. She's an excellent runner due to her mother's athleticism but can be clumsy at times because of her father's tendency to stumble. In contrast to Izumi's dislike of sweets, Mizuki enjoys them and is quite stingy when sharing food. Additionally, she loves animals, as seen with Yujirou, Sano's dog.