We Without Wings: Eriko Hino

Eriko is a c friend of  Kinako and has a habit of getting kicked out of parties.

Girl's High: Eriko Takahashi

Eriko is the cheerful and friendly main character of the story.  She decided to go to an all girls school because she thought it would be more sophisticated than a normal school. It would be an expectation that was dashed on her first day.  She can be surprisingly observant being the first to see thru Momoka's scheme.