Kusakabe Shiori

A student that attends the same school as the main character and his friends, and his junior by one year.
She is a shy, bashful girl, of the type that makes one want to protect her with bravery and courage.
She relies on those people she is used to, but she is so anxious about strangers she can barely talk with people she does not know well.
She has trouble saying what she means, but she has a good grip on her thoughts and ponders things thoroughly.
She loves books and is a fountain of knowledge, having read everything from light novels to the Kojien itself.

She looks young, but her breasts are large, and still manages to attract the gaze of men.
Because of this, she loves to imagine she is something like a princess from a fairy tale, who has a hard time dealing with men.

She has been close friends with Airi since they were young, so she can speak with her in a friendly tone.
She usually ends up entangled in Airi's reckless schemes.

From MangaGamer