Narumi Tamaki is normally a serious and unassuming girl with hidden big breasts. She volunteered to be in an AV shoot out of curiosity, and her job is to be a middle school teacher. She doesn't want to be found out, but her desire to experience amazing sex is stronger, so would it be okay if she appeared in the film secretly? Her excitement at being in the AV world she normally watches and her inherent perverted nature sparked, and she suddenly reacted with trembling excitement and orgasmed in her shocking first shoot. "I took out my H-cup breasts without telling anyone..."