A First year 2nd course student in E class with Tatsuya, Mikihiko, Leo and Mizuki
A beauty in her own right she is someone who garners attention from those around her.
She has an outgoing personality that allows her to befriend people easily but is someone who is not easily committed and goes off on a whim, (She doesnt get along with Leo though).
Erika is described as a beautiful young girl whose short, bright hair (which become longer over the course of the series and are worn in a ponytail) and distinct facial features amplify the impression of her being a lively girl. She is bright and optimistic, and a person who gets carried away easily.
A member of one of the 'Hundreds Families' the Chiba family, a family famous for training people in swordsmanship.
She herself is proficient in the sword, enough for her to be recognised and allowed to carry the Chiba family name.