Erika Saionji 西園寺えりか

A female freshman student, whom R discovered when he accidentally tripped and pulled down her skirt. Despite being in the wrong school, Erika is hyper, sweet, and cheerful. Her older sister Marii also goes to school and is embarrassed by her younger sister's presence. Erika has a very outward crush on R, and has fought with Sayoko over this.