Sayaka-chan is a fourth-year student at F Women's University, a famous women's college for rich girls. She has always been a "good girl" and has never rebelled against her parents, but she was nervous when the staff invited her to join in! Her body was hot, her genitals were wet despite her reason, and she naturally let out moans... It was late summer when she realized for the first time that she was a "pervert" because of Kokoro of guilt towards her parents.