女子高中生

Protagonist Eriko Takahashi enters Fuji High School of the private Yamazaki Girls' Academy (abbreviated as "Sakijo") together with her close friends from middle school, Yumi Suzuki and Ayano Sato. Eriko, who had dreamy fantasies about an all-girls school, sneaks into the campus for an adventure before officially enrolling and discovers the reality of a girls' school where true natures are revealed in the absence of boys: dirty club rooms, undisciplined seniors, girls who have lost immunity to men and turned to homosexuality... What interesting things will happen to Eriko, who is determined to become a "clean, stylish, and non-conformist high school girl"?