Mio Kisaragi

Yuma's childhood friend, she is a mild tsundere with a tendency to try to force a 'clean and proper lifestyle' on Yuma whenever possible, bribing him with her homemade lunches in order to get him to come to school. While Yuma seems to think she might dislike him, it is obvious to anyone else that the reverse is actually the case. (Source: clephasstomach.blogspot.com)