Kudo Sayaka is a 2nd-grade high school student, a gal (Gyaru) who wears miniskirts and dyes her hair blonde. Even though she is a high school student, her actual academic grade level is on par with 4th-grade elementary school students. During the summer, Sayaka attends a private institution, where she meets Teacher Tsubota. Besides her mother, Teacher Tsubota is the first adult to praise her, and through his guidance and instruction, Sayaka begins to change.