After school, she was assaulted by her male homeroom teachers. She experienced her first orgasm and had sex three times. She is a 3-year-old girl named Kashiwagi Konatsu with F-cup breasts. She is 18 years old. (SDAB-206)

An earnest, ordinary girl is accidentally seen masturbating in the study room of a cram school, and begins an unimaginable, humiliating play with her teacher in uniform! Her perverted nature, initially subservient to the teacher's demands, begins to sprout, and she starts actively seeking out the teacher! The sense of transgression felt when classmates are taking classes nearby… One summer day during a lecture transforms her into a pervert.