Risa is a student attending a nursing school. Until she graduated from high school, she was a quiet and serious girl who grew up in the countryside, so she never had a boyfriend and never had much interest in sex. Risa entered a nursing school in Tokyo and started living alone. Becoming a nurse was her dream since she was a child. There were few entertainment options in her hometown, so she studied hard, but Tokyo has many places to play and the last trains last until late, so she played a lot more than she did in high school, when her curfew was 6 o'clock. A few months after entering the school, she was invited by a friend to go to a certain university's cultural festival. There, she was picked up by a man who seemed to be a student at that university. It was her first time being picked up, so she was excited. Soon after, Risa and the university student started dating. He was her boyfriend and she gave him her first time, but after about three months, they gradually stopped contacting each other and the relationship naturally faded away. After that, Risa wanted a sex friend more than a boyfriend. When he picked her up, she usually went along with him and had a physical relationship right away. School was busy and she couldn't work part-time much, so she preferred a sex friend who she could hang out with whenever she wanted rather than a boyfriend. As she entered her third year and became busier with training and other things, Risa quit the part-time job she had been doing little by little and stopped contacting her sex friend as much. She wanted to relieve stress by having fun, but her friends at school were busy and she didn't have much money, so she was wandering around town by herself, wondering what to do. Rather than thinking about what to do, she was mostly just waiting to be hit on. Then a man hit on her and she accepted his invitation, and here we are today.