Yamanaka Fumika♀

Self declared guardian of the protagonist, upright girl, and a teacher responsible for rectifying discipline. She has known the protagonist for a long time, and often hangs out together, since then she has thought the protagonist to be a very cute boy and is always thinking about him. As his guardian and onee-chan, she is very eager to get along with him. She drinks because she consider drinking an adult's hobby, but she can't hold her alcohol, and once she is drunk she begins to cry. Because she wants people to see her mature side, she only wears her glasses at school.