Fujiki Sakino♀

Sakino is Hideaki's friend, and another one of his classmates. She is childhood friends with Madoka, and is very close with her. She has a serious personality, wears glasses, and constantly tries to get Madoka to settle down and do her work. Sakino dislikes physical exercise, unlike Madoka. She sometimes is a shy person, but is able to become more sociable, though still generally dislikes speaking to others. This gives her a gloomy appearance, but she is just constantly thinking about things.

[from Wikipedia]