Saki Miyamoto is a current music teacher who appears kind and gentle. Despite her demure appearance, she has a glamorous body and readily agrees to a scout's offer out of curiosity, heading to the studio for her shoot. Once filming begins, her past reveals shockingly explicit details. She confesses to having had a sexual relationship with her middle school's band club advisor, engaging in repeated sex with him after school. Her surprisingly lustful side, completely opposite to her modest looks, is thoroughly exposed through intense gonzo filming.