Miki Koishikawa(小石川 光希Koishikawa Miki) is a lively high school student, who is on the Toryo High School tennis team. She is cheerful, friendly, supportive, outspoken, tomboyish and good-hearted. On the other hand, she can also be insecure, whiny, clingy, and very emotionally dependent on others. She had a part-time job working in an ice cream parlor, called Bobson's. Later, she works in a small decoration shop.