Hashimoto Rina, a 19-year-old music student. She has played piano for about 12 years and currently specializes in flute. She doesn't have a boyfriend—hasn't had one for the past three months—and has hardly any sexual experiences. She masturbates about three times a week, feeling lonely every day, often doing something sexual before bed. When it comes to being S or M, she's a total masochist. Her entire body is an erogenous zone, getting wet easily and extremely sensitive—more than she ever imagined. Her music school is all girls, leaving no opportunities to meet people. Her sex fantasies are endless. One day, while living this routine, she received a message from a mysterious older man she'd randomly met on social media—today is the day they're supposed to meet. Filled with mixed emotions of anxiety and anticipation, her pussy is already throbbing with excitement.